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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;
const long long inf = 1e+9 + 7;
int main() {
  long long n, i, j = 0;
  string s;
  char c;
  cin >> s;
  for (i = 0; i < s.size(); ++i) {
    c = s[i];
    j += (c >= 'a' ? c - 'a' + 1 : c - 'A' + 1) *
         ((int)(c > '@' && c < ']') - (int)(c > '`' && c < '{'));
  }
  cout << j;
  return 0;
}
