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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() {
  ios::sync_with_stdio(false);
  string s;
  cin >> s;
  int ans = 0;
  for (int i = 0; i < s.size(); i++) {
    char ch = s[i];
    int and1a = ('@' < ch);
    int and1b = ('[' > ch);
    int and2a = ('`' < ch);
    int and2b = ('{' > ch);
    int t1a = (and1a & and1b);
    int t1b = 0;
    if (ch >= 'a' && ch <= 'z') t1b = ch - 'a' + 1;
    if (ch >= 'A' && ch <= 'Z') t1b = ch - 'A' + 1;
    int t2a = t1b;
    int t2b = (and2a && and2b);
    int mi = (t1a * t1b - t2a * t2b);
    ans += mi;
  }
  cout << ans << endl;
  return 0;
}
