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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;
string s;
char c;
int ai(void) { return (int)(toupper(c) - 'A') + 1; }
int main() {
  int res = 0;
  cin >> s;
  for (int i = 0; i < s.length(); i++) {
    c = s[i];
    res +=
        ((int)('[' > c && '@' < c) * ai()) - (ai() * (int)('`' < c && '{' > c));
  }
  printf("%d\n", res);
  return 0;
}
