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Input

The only line of the input is a string (between 1 and 50 characters long, inclusive). Each character will be an alphanumeric character or a full stop ".".

Output

Output the required answer.

Examples

Input

Codeforces


Output

-87


Input

APRIL.1st


Output

17
#include <bits/stdc++.h>
using namespace std;
signed main() {
  string s;
  cin >> s;
  int ans = 0;
  for (char c : s) {
    if (!isalpha(c)) continue;
    int a1 = ('@' < c) && ('[' > c);
    int a2 = ('`' < c) && ('{' > c);
    int idx = c - (isupper(c) ? 'A' : 'a') + 1;
    ans += idx * a1 - idx * a2;
  }
  cout << ans << endl;
}
