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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 second;
  cin >> second;
  long long res = 0;
  for (int i = 0; i < second.size(); i++) {
    bool a, b, c, d;
    a = (second[i] > '@');
    b = (second[i] < '[');
    c = (second[i] > '`');
    d = (second[i] < '{');
    a = a && b;
    b = c && d;
    res +=
        a * (tolower(second[i]) - 'a' + 1) - b * (tolower(second[i]) - 'a' + 1);
  }
  cout << res;
  return 0;
}
