/*
 * @Author:             cmk666
 * @Created time:       2023-08-02 21:06:26
 * @Last Modified time: 2023-08-02 21:28:37
 */
#pragma GCC optimize("Ofast", "unroll-loops")
#include<bits/stdc++.h>
using namespace std; using ll = long long;
#define For(i, j, k) for ( int i = (j) ; i <= (k) ; i++ )
#define Fol(i, j, k) for ( int i = (j) ; i >= (k) ; i-- )
namespace FastIO
{
// ------------------------------
// #define IN_HAS_NEG
#define OUT_HAS_NEG
// #define CHK_EOF
// #define DISABLE_MMAP
// ------------------------------
#if __cplusplus < 201400
#error Please use C++14 or higher.
#endif
#if __cplusplus > 201700
#define INLINE_V inline
#else
#define INLINE_V
#endif
#if ( defined(LOCAL) || defined(_WIN32) ) && !defined(DISABLE_MMAP)
#define DISABLE_MMAP
#endif
#ifndef DISABLE_MMAP
#include<sys/mman.h>
#endif
#ifdef LOCAL
	inline char gc() { return getchar(); }
	inline void pc(char c) { putchar(c); }
#else
#ifdef DISABLE_MMAP
	INLINE_V constexpr int _READ_SIZE = 1 << 18;
	INLINE_V static char _read_buffer[_READ_SIZE], *_read_ptr = nullptr, *_read_ptr_end = nullptr;
	inline char gc()
	{
		if ( __builtin_expect(_read_ptr == _read_ptr_end, false) )
		{
			_read_ptr = _read_buffer;
			_read_ptr_end = _read_buffer + fread(_read_buffer, 1, _READ_SIZE, stdin);
#ifdef CHK_EOF
			if ( __builtin_expect(_read_ptr == _read_ptr_end, false) ) return EOF;
#endif
		}
		return *_read_ptr++;
	}
#else
	INLINE_V static const char *_read_ptr = (const char *)mmap(nullptr, INT_MAX, 1, 2, 0, 0);
	inline char gc() { return *_read_ptr++; }
#endif
	INLINE_V constexpr int _WRITE_SIZE = 1 << 18;
	INLINE_V static char _write_buffer[_WRITE_SIZE], *_write_ptr = _write_buffer;
	inline void pc(char c)
	{
		*_write_ptr++ = c;
		if ( __builtin_expect(_write_buffer + _WRITE_SIZE == _write_ptr, false) )
		{
			fwrite(_write_buffer, 1, _write_ptr - _write_buffer, stdout);
			_write_ptr = _write_buffer;
		}
	}
	INLINE_V struct _auto_flush
	{
		inline ~_auto_flush() { fwrite(_write_buffer, 1, _write_ptr - _write_buffer, stdout); }
	}	_auto_flush;
#endif
#ifdef CHK_EOF
	inline constexpr bool _isdigit(char c) { return ( c & 16 ) && c != EOF; }
	inline constexpr bool _isgraph(char c) { return c > 32 && c != EOF; }
#else
	inline constexpr bool _isdigit(char c) { return c & 16; }
	inline constexpr bool _isgraph(char c) { return c > 32; }
#endif
	template < class T >
	INLINE_V constexpr bool _is_integer = numeric_limits < T >::is_integer;
	template < class T >
	INLINE_V constexpr bool _is_signed = numeric_limits < T >::is_signed;
	template < class T >
	INLINE_V constexpr bool _is_unsigned = _is_integer < T > && !_is_signed < T >;
	template <> INLINE_V constexpr bool _is_integer < __int128 > = true;
	template <> INLINE_V constexpr bool _is_integer < __uint128_t > = true;
	template <> INLINE_V constexpr bool _is_signed < __int128 > = true;
	template <> INLINE_V constexpr bool _is_unsigned < __uint128_t > = true;
#undef INLINE_V
	inline void read(char &c) { do c = gc(); while ( !_isgraph(c) ); }
	inline void read_cstr(char *s)
	{
		char c = gc(); while ( !_isgraph(c) ) c = gc();
		while ( _isgraph(c) ) *s++ = c, c = gc();
		*s = 0;
	}
	inline void read(string &s)
	{
		char c = gc(); s.clear(); while ( !_isgraph(c) ) c = gc();
		while ( _isgraph(c) ) s.push_back(c), c = gc();
	}
#ifdef IN_HAS_NEG
	template < class T, enable_if_t < _is_signed < T >, int > = 0 >
	inline void read(T &x)
	{
		char c = gc(); bool f = true; x = 0;
		while ( !_isdigit(c) ) { if ( c == 45 ) f = false; c = gc(); }
		if ( f ) while ( _isdigit(c) ) x = x * 10 + ( c & 15 ), c = gc();
		else     while ( _isdigit(c) ) x = x * 10 - ( c & 15 ), c = gc();
	}
	template < class T, enable_if_t < _is_unsigned < T >, int > = 0 >
#else
	template < class T, enable_if_t < _is_integer < T >, int > = 0 >
#endif
	inline void read(T &x)
	{
		char c = gc(); while ( !_isdigit(c) ) c = gc();
		x = 0; while ( _isdigit(c) ) x = x * 10 + ( c & 15 ), c = gc();
	}
	inline void write(char c) { pc(c); }
	inline void write_cstr(const char *s) { while ( *s ) pc(*s++); }
	inline void write(const string &s) { for ( char c : s ) pc(c); }
#ifdef OUT_HAS_NEG
	template < class T, enable_if_t < _is_signed < T >, int > = 0 >
	inline void write(T x)
	{
		char buffer[numeric_limits < T >::digits10 + 1]; int digits = 0;
		if ( x >= 0 )  do buffer[digits++] =  ( x % 10 ) | 48, x /= 10; while ( x );
		else { pc(45); do buffer[digits++] = -( x % 10 ) | 48, x /= 10; while ( x ); }
		while ( digits ) pc(buffer[--digits]);
	}
	template < class T, enable_if_t < _is_unsigned < T >, int > = 0 >
#else
	template < class T, enable_if_t < _is_integer < T >, int > = 0 >
#endif
	inline void write(T x)
	{
		char buffer[numeric_limits < T >::digits10 + 1]; int digits = 0;
		do buffer[digits++] = ( x % 10 ) | 48, x /= 10; while ( x );
		while ( digits ) pc(buffer[--digits]);
	}
	template < int N > struct _tuple_io_helper
	{
		template < class ...T >
		static inline void _read(tuple < T... > &x)
		{ _tuple_io_helper < N - 1 >::_read(x), read(get < N - 1 > (x)); }
		template < class ...T >
		static inline void _write(const tuple < T... > &x)
		{ _tuple_io_helper < N - 1 >::_write(x), pc(32), write(get < N - 1 > (x)); }
	};
	template <> struct _tuple_io_helper < 1 >
	{
		template < class ...T >
		static inline void _read(tuple < T... > &x) { read(get < 0 > (x)); }
		template < class ...T >
		static inline void _write(const tuple < T... > &x) { write(get < 0 > (x)); }
	};
	template < class ...T >
	inline void read(tuple < T... > &x) { _tuple_io_helper < sizeof...(T) >::_read(x); }
	template < class ...T >
	inline void write(const tuple < T... > &x) { _tuple_io_helper < sizeof...(T) >::_write(x); }
	template < class T1, class T2 >
	inline void read(pair < T1, T2 > &x) { read(x.first), read(x.second); }
	template < class T1, class T2 >
	inline void write(const pair < T1, T2 > &x) { write(x.first), pc(32), write(x.second); }
	template < class T1, class ...T2 >
	inline void read(T1 &x, T2 &...y) { read(x), read(y...); }
	template < class ...T >
	inline void read_cstr(char *x, T *...y) { read_cstr(x), read_cstr(y...); }
	template < class T1, class ...T2 >
	inline void write(const T1 &x, const T2 &...y) { write(x), write(y...); }
	template < class ...T >
	inline void write_cstr(const char *x, const T *...y) { write_cstr(x), write_cstr(y...); }
	template < class T >
	inline void print(const T &x) { write(x); }
	inline void print_cstr(const char *x) { write_cstr(x); }
	template < class T1, class ...T2 >
	inline void print(const T1 &x, const T2 &...y) { print(x), pc(32), print(y...); }
	template < class ...T >
	inline void print_cstr(const char *x, const T *...y) { print_cstr(x), print_cstr(y...); }
	inline void println() { pc(10); }
	inline void println_cstr() { pc(10); }
	template < class ...T >
	inline void println(const T &...x) { print(x...), pc(10); }
	template < class ...T >
	inline void println_cstr(const T *...x) { print_cstr(x...), pc(10); }
}
using namespace FastIO;
char s[200009], t[9]; int n, m, p = 1; vector < tuple < char, int, int > > seg;
inline int solve_a(char a) { return count(s + 1, s + n + 1, a) ? -1 : 0; }
inline int solve_aa(char a)
{
	if ( count(s + 1, s + n + 1, a) > n / 2 + n % 2 ) return -1;
	int ret = 0;
	for ( auto [c, l, r] : seg ) if ( c == a ) ret += r - l;
	return ret;
}
inline int solve_ab(char a, char b)
{
	int ret = 0;
	for ( auto [c, l, r] : seg ) if ( c == b && l != 1 ) ret++;
	return ret;
}
inline int solve_aaa(char a)
{
	if ( count(s + 1, s + n + 1, a) > n / 3 * 2 + n % 3 ) return -1;
	int ret = 0; priority_queue < int > p, q;
	for ( auto [c, l, r] : seg )
		if ( c != a ) For(i, 1, r - l) p.push(2);
		else if ( l == r ) p.push(1);
		else if ( r - l > 1 ) q.push(r - l - 1);
	for ( int u, v, w ; p.size() && q.size() ; )
	{
		u = p.top(), p.pop(), v = q.top(), q.pop(), ret++;
		if ( u > min(u, v) ) p.push(u - min(u, v));
		if ( v > min(u, v) ) q.push(v - min(u, v));
	}
	return ret;
}
inline int solve_aba(char a, char b)
{
	int ret = 1;
	for ( auto [c, l, r] : seg ) if ( c == b && l == r && l != 1 && r != n ) ret++;
	return ret / 2;
}
inline int solve_axb(char a, char x, char b)
{
	int ret = 0;
	For(i, 3, n) if ( s[i - 2] == a && s[i - 1] == x && s[i] == b ) ret++;
	return ret;
}
int main()
{
	read_cstr(s + 1, t + 1), n = strlen(s + 1), m = strlen(t + 1);
	For(i, 2, n + 1) if ( s[i] != s[p] ) seg.emplace_back(s[p], p, i - 1), p = i;
	if ( m == 1 ) return println(solve_a(t[1])), 0;
	if ( m == 2 ) return println(t[1] == t[2] ? solve_aa(t[1]) : solve_ab(t[1], t[2])), 0;
	if ( t[1] == t[2] && t[1] == t[3] ) return println(solve_aaa(t[1])), 0;
	return println(t[1] == t[3] ? solve_aba(t[1], t[2]) : solve_axb(t[1], t[2], t[3])), 0;
}
// 想上IM捏 想上IM捏 想上IM捏 想上IM捏 想上IM捏