#include <bits/stdc++.h>

using namespace std;

const int N = 100000 + 5;

int n, m, cnt = 0;
char s[N], t[N], tmp[N];

int main() {
//	freopen("string.in", "r", stdin);
//	freopen("string.out", "w", stdout);
	
	scanf("%s", s + 1);
	scanf("%s", t + 1);
	
	n = strlen(s + 1), m = strlen(t + 1);
	
	int i = 1, j = 1, ans = 0;
	while(i <= n && j <= m) {
		int isok = 1;
		while(i <= n && j <= m && s[i] == t[j]) {
			tmp[++ cnt] = s[i];
			if(tmp[cnt - 1] > tmp[cnt]) {
				ans ++, isok = 0;
				break;
			}
			i ++, j ++;
		}
		
		if(!isok) break;
		
		if(i > n) {
			ans += m - j + 2;
			break;
		}
		
		if(j > m) break;
		
		if(t[j] < s[i]) break;
		
		ans ++;
		if(tmp[cnt] > t[j]) {
			break;
		}else j ++;
	}
	
	printf("%d\n", ans);
	
	return 0;
}