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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;
long long sum = 0;
int main() {
  char c;
  while (cin >> c) {
    if (isalpha(c)) sum += isupper(c) ? c - 'A' + 1 : -(c - 'a' + 1);
  }
  cout << sum;
  return 0;
}
