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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 c;
int tot;
int main() {
  while (cin >> c)
    if ('a' <= c && c <= 'z')
      tot -= c - 96;
    else if ('A' <= c && c <= 'Z')
      tot += c - 64;
  cout << tot;
  return 0;
}
