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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 main() {
  string s;
  cin >> s;
  int res = 0;
  for (char c : s) {
    int v1 = int('@' < c);
    int v2 = int('[' > c);
    int v3 = int('`' < c);
    int v4 = int('{' > c);
    c = toupper(c);
    res += (c - 'A' + 1) * (v1 & v2) - (c - 'A' + 1) * (v3 & v4);
  }
  cout << res << endl;
  return 0;
}
