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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;
long long work(char c) {
  int i, j, tmp, k, l;
  if (c < '@' && '[' > c)
    i = 1;
  else
    i = 0;
  if ('`' < c && '{' > c)
    j = 1;
  else
    j = 0;
  if (c >= 'a')
    tmp = c - 'a' + 1;
  else
    tmp = c - 'A' + 1;
  return (i - j) * tmp;
}
int main() {
  char s[1000];
  scanf("%s", s);
  int len = strlen(s);
  long long ans = 0;
  for (int i = 0; i < len; i++) {
    if (s[i] >= 'a' && s[i] <= 'z') ans -= s[i] - 'a' + 1;
    if (s[i] >= 'A' && s[i] <= 'Z') ans += s[i] - 'A' + 1;
  }
  cout << ans << endl;
  return 0;
}
