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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_base::sync_with_stdio(false);
  cin.tie(nullptr);
  cout.tie(nullptr);
  cerr.tie(nullptr);
  string s;
  cin >> s;
  int sol = 0;
  for (char x : s) {
    bool gornji = '@' < x && '[' > x;
    bool donji = '`' < x && '{' > x;
    int p1 = (int)gornji * (int)(x - 'A' + 1);
    int p2 = (int)donji * (int)(x - 'a' + 1);
    sol += p1 - p2;
  }
  cout << sol;
}
