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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;
string a;
int main() {
  cin >> a;
  int sum = 0;
  for (int i = 0; i <= a.length(); i++) {
    char t = a[i];
    if (t >= 'A' && t <= 'Z') {
      sum += t - '@';
    }
    if (t >= 'a' && t <= 'z') {
      sum -= t - '`';
    }
  }
  cout << sum << endl;
  return 0;
}
