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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;
int main() {
  string str;
  cin >> str;
  int res = 0, x;
  for (int i = 0; i < str.length(); i++) {
    x = tolower((char)str[i]) - 'a' + 1;
    if (isupper((char)str[i])) {
      res += x;
    } else if (islower((char)str[i])) {
      res -= x;
    }
  }
  cout << res << endl;
  return 0;
}
