#include <bits/stdc++.h>
 
#define pb push_back
#define mp make_pair
#define mod 1000000007
#define PI 3.141592653589793;
 
using namespace std;

int a[20005], res = 0, j;
string s;

int main() {
    //freopen("data.in", "r", stdin);
    //freopen("data.out", "w", stdout);

    cin>>s;
    for(int i = 0; i < s.size(); i++){
        a[i+1] = a[i] + int(s[i]) - int('a') + 1;
        if(i<9) {
            res = max(res, a[i+1]);
        }
        else {
            res = max(a[i+1] - a[j], res);
            j++;
        }
    }
    cout<<res;
}