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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 a;
  cin >> a;
  int x, y, sum = 0;
  for (int i = 0; i < a.size(); i++) {
    x = 0;
    y = 0;
    if (a[i] > '@' && a[i] < '[') {
      x = a[i] - 'A' + 1;
    }
    if (a[i] > '`' && a[i] < '{') {
      y = a[i] - 'a' + 1;
    }
    sum += x - y;
  }
  cout << sum;
  return 0;
}
