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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 main() {
  std::string s;
  std::cin >> s;
  int res = 0;
  for (int pos = 0; pos < s.length(); ++pos) {
    int a, b, c, d;
    a = s[pos] >= 'A' && s[pos] <= 'Z';
    b = s[pos] >= 'a' && s[pos] <= 'z';
    int alph_pos = 0;
    if (s[pos] >= 'a' && s[pos] <= 'z') alph_pos = s[pos] - 'a' + 1;
    if (s[pos] >= 'A' && s[pos] <= 'Z') alph_pos = s[pos] - 'A' + 1;
    res += (a * (alph_pos)) - (b * (alph_pos));
  }
  std::cout << res;
}
