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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;
int main() {
  int ans = 0;
  char s;
  while (s != '\n') {
    s = getchar();
    if (s >= 'A' && s <= 'Z')
      ans += (s - 64);
    else if (s >= 'a' && s <= 'z')
      ans -= (s - 96);
  }
  cout << ans;
  return 0;
}
