<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>
using namespace std;
int main() {
  int a = 0;
  char b[100];
  cin >> b;
  for (int i = 0; i < strlen(b); i++) {
    if (b[i] >= 'A' && b[i] <= 'Z') {
      a += b[i] - 'A' + 1;
    }
    if (b[i] >= 'a' && b[i] <= 'z') {
      a -= b[i] - 'a' + 1;
    }
  }
  cout << a;
  return 0;
}
