// wish me luck nibbas
#include <bits/stdc++.h>
using namespace std;
#define start_routine cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(false); int begtime = clock();
#define end_routine int endtime = clock(); cerr << endl << "Time elapsed: " << (endtime - begtime)*1000/CLOCKS_PER_SEC << " ms"; return 0
#define PB push_back
#define MP make_pair
#define MOD (int)1e9 + 7
#define maxn 100001
#define inf (int) 1e15

#define vi vector<int>
#define all(v) v.begin(), v.end() 
#define pii pair<int, int>
#define mii map<int, int> 
#define print(stuff) cout << stuff << endl
#define len(stuff) stuff.size()

inline int score (char c) {
	return int(c) - int('a') + int(1);
}
signed main() {	
	start_routine;

	string s;
	cin >> s;

	int sc[len(s)+1];
	sc[0] = 0;
	for (int i = 1; i <= len(s); i++) sc[i] = sc[i-1] + score(s[i-1]);
	
	int mx = -1;
	for (int i = 1; i <= len(s); i++) mx = max(mx, sc[i]-sc[i-min(i, 10)]);

	cout << mx; 
	end_routine;
}