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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;
string st;
long long sum = 0;
int main() {
  int i, j, k, n;
  cin >> st;
  for (i = 0; i < st.length(); i++)
    if (st[i] >= 'A' && st[i] <= 'Z')
      sum += (st[i] - 'A' + 1);
    else if (st[i] >= 'a' && st[i] <= 'z')
      sum -= (st[i] - 'a' + 1);
  cout << sum << endl;
  return 0;
}
