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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 sum;
string s;
int main() {
  cin >> s;
  int l = s.size();
  for (int i = 0; i < l; i++) {
    if (isupper(s[i])) {
      sum += s[i] - '@';
      continue;
    }
    if (islower(s[i])) {
      sum -= s[i] - '`';
      continue;
    }
  }
  cout << sum;
  return 0;
}
