#include <iostream>
#include <string.h>
using namespace std;

int n, s[20005], maxi;
char a[20005], c;

int main() {
    cin >> a;
    n = strlen(a);

    for (int i = 0; i < n; ++i) {
        s[i + 1] = a[i] - 'a' + 1 + s[i];
    }

    if (n < 10) {
        cout << s[n];
    } else {
        for (int i = 10; i <= n; ++i) {
            maxi = max(maxi, s[i] - s[i - 10]);
        }

        cout << maxi;
    }


}