<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;
  long s1 = 0, s2 = 0;
  cin >> str;
  for (auto c : str) {
    if (c >= 'a' && c <= 'z') {
      s1 += c - 'a' + 1;
    } else if (c >= 'A' && c <= 'Z') {
      s2 += c - 'A' + 1;
    }
  }
  cout << (s2 - s1) << endl;
  return 0;
}
