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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[55];
int len, ans;
int check(char c) {
  bool f1 = ('@' < c);
  bool f2 = ('[' > c);
  bool f3 = ('`' < c);
  bool f4 = ('{' > c);
  int a = (f1 && f2);
  int b = (f3 && f4);
  int x;
  if (c >= 'a')
    x = c - 'a' + 1;
  else
    x = c - 'A' + 1;
  return a * x - b * x;
}
int main() {
  ans = 0;
  scanf("%s", s);
  len = strlen(s);
  for (int i = 0; i < len; i++) {
    ans += check(s[i]);
  }
  printf("%d\n", ans);
  return 0;
}
