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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;
const int MAXN = 100500;
int main() {
  string s;
  cin >> s;
  long long res = 0;
  for (int i = 0; i < (int)s.size(); ++i) {
    if ('A' <= s[i] && s[i] <= 'Z') res += s[i] - 'A' + 1;
    if ('a' <= s[i] && s[i] <= 'z') res -= s[i] - 'a' + 1;
  }
  cout << res;
  return 0;
}
