<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() {
  string str;
  int ans = 0;
  getline(cin, str);
  int len = str.length();
  for (int i = 0; i <= len - 1; i++) {
    if (isupper(str[i])) {
      ans += str[i] - 64;
    }
    if (islower(str[i])) {
      ans -= str[i] - 96;
    }
  }
  cout << ans << endl;
  return 0;
}
