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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 r[20], m[20];
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  string s;
  cin >> s;
  int res = 0;
  for (int i = 0; i < s.length(); ++i) {
    char c = s[i];
    int n = tolower(c) - 'a' + 1;
    int a;
    if ('@' < c && '[' > c)
      a = n;
    else
      a = 0;
    int b;
    if ('`' < c && '{' > c)
      b = n;
    else
      b = 0;
    res += a - b;
  }
  cout << res << '\n';
  return 0;
}
