#include <bits/stdc++.h>

using namespace std;

#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define RFOR(i, a, b) for(int i = (a) - 1; i >= (b); i--)
#define SZ(a) int(a.size())
#define ALL(a) a.begin(), a.end()
#define PB push_back
#define MP make_pair
#define F first
#define S second

typedef long long LL;
typedef vector<int> VI;
typedef vector<LL> VL;
typedef pair<int, int> PII;
typedef pair<LL, LL> PLL;
typedef double db;

int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	string s;
	getline(cin, s);
	VI cnt(26);
	FOR (i, 0, SZ(s))
	{
		if ('A' <= s[i] && s[i] <= 'Z')
			s[i] += 'a' - 'A';
		if ('a' <= s[i] && s[i] <= 'z')
			cnt[s[i] - 'a']++;
	}
	sort(ALL(cnt), greater());
	int total = accumulate(ALL(cnt), 0);
	int ans = (total - 1)* 3;
	VI lens;
	FOR (l, 1, 7)
	{
		FOR (mask, 0, 1 << l)
		{
			int cost = l - 1;
			FOR (j, 0, l)
			{
				if ((mask >> j) & 1)
					cost += 3;
				else
					cost += 1;
			}
			lens.PB(cost);
		}
	}
	sort(ALL(lens));
	FOR (i, 0, 26)
		ans += lens[i] * cnt[i];
	cout << ans << '\n';
	
	return 0;
}