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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 s;
int id(char c) {
  if (c >= 'A' && c <= 'Z') return c - 'A' + 1;
  if (c >= 'a' && c <= 'z') return c - 'a' + 1;
}
int main() {
  long long res = 0;
  cin >> s;
  for (int i = 0; i < s.size(); i++) {
    char a1 = '@';
    char a2 = '[';
    char a3 = '`';
    char a4 = '{';
    int flag1 = (a1 < s[i]) & (a2 > s[i]);
    int flag2 = (a3 < s[i]) & (a4 > s[i]);
    res = res + (flag1 * id(s[i])) - (flag2 * id(s[i]));
  }
  cout << res << endl;
}
