<image>

You can preview the image in better quality by the link: [http://assets.codeforces.com/files/656/without-text.png](//assets.codeforces.com/files/656/without-text.png)

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>
const char* CS =
    ".0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
int main() {
  char s[64];
  scanf("%s", &s[1]);
  int n = strlen(&s[1]), ans = 0;
  for (int i = 1; i <= n; i++) {
    if ('A' <= s[i] && s[i] <= 'Z')
      ans += s[i] - 'A' + 1;
    else if ('a' <= s[i] && s[i] <= 'z')
      ans -= s[i] - 'a' + 1;
  }
  printf("%d\n", ans);
}
