<image>

You can preview the image in better quality by the link: [http://assets.codeforces.com/files/656/without-text.png](//assets.codeforces.com/files/656/without-text.png)

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 int N = 100005;
char str[N];
int main() {
  cin >> str;
  int res = 0;
  for (int i = 0; str[i]; ++i) {
    char c = str[i];
    int a1 = ('@' < c);
    int a2 = ('[' > c);
    int a3 = ('`' < c);
    int a4 = ('{' > c);
    int b1 = a1 && a2;
    int b2 = a3 && a4;
    int ch = isupper(c) ? c - 'A' + 1 : c - 'a' + 1;
    int c1 = b1 * ch;
    int c2 = b2 * ch;
    res += c1 - c2;
  }
  cout << res << endl;
  return 0;
}
