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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 long long INF = 1e9 + 7;
const int N = 1e6 + 10;
int main() {
  string str;
  getline(cin, str);
  int ans = 0;
  for (auto& c : str) {
    if (isupper(c)) ans += c - 64;
    if (islower(c)) ans -= c - 96;
  }
  printf("%d\n", ans);
  return 0;
}
