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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>
int alphabetIndex(char c) {
  if (c >= 'a' && c <= 'z') {
    c -= 32;
  }
  return c - 64;
}
int main() {
  std::string str;
  std::cin >> str;
  int res = 0;
  for (auto c : str) {
    int temp0 = ('@' < c && '[' > c) ? 1 : 0;
    int temp1 = ('`' < c && '{' > c) ? 1 : 0;
    int minus = alphabetIndex(c) * (temp0 - temp1);
    res += minus;
  }
  std::cout << res;
}
