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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;
char ch;
int ans = 0;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0), cout.tie(0);
  while (cin >> ch) {
    if (ch >= 'A' and ch <= 'Z') {
      ans += ch - 'A' + 1;
    }
    if (ch >= 'a' && ch <= 'z') {
      ans -= ch - 'a' + 1;
    }
  }
  cout << ans;
  return 0;
}
