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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 s;
int res;
int main() {
  cin >> s;
  for (char c : s) {
    int x = '@' < c && '[' > c;
    int y = '`' < c && '{' > c;
    if (x) res += c - 'A' + 1;
    if (y) res -= c - 'a' + 1;
  }
  cout << res << '\n';
}
