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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;
char s[100];
int cc(char ch) {
  if (ch >= 'A' && ch <= 'Z') return ch - 'A' + 1;
  if (ch >= 'a' && ch <= 'z') return -(ch - 'a' + 1);
  return 0;
}
int main() {
  scanf("%s", s);
  int len = strlen(s), ans = 0;
  for (int i = 0; i < len; i++) ans += cc(s[i]);
  printf("%d\n", ans);
  return 0;
}
