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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 T, t, n, m;
char s[110];
int sum;
int main() {
  int i, j, k, a, b, d, e, f;
  char c;
  scanf("%s", s + 1);
  n = strlen(s + 1);
  for (i = 1; i <= n; i++) {
    c = s[i];
    if ('@' < c && '[' > c)
      a = 1;
    else
      a = 0;
    if ('`' < c && '{' > c)
      b = 1;
    else
      b = 0;
    if (a == 1)
      sum += c - 64;
    else if (b == 1)
      sum -= c - 96;
  }
  printf("%d\n", sum);
}
