<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 s;
  long long ans = 0;
  cin >> s;
  for (long long i = 0; i < s.size(); i++) {
    char c = s[i];
    long mul = c >= 'a' ? c - 'a' : c - 'A';
    ans += (mul + 1) * (('@' < c && '[' > c) - ('`' < c && '{' > c));
  }
  cout << ans;
}
