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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 mineq(int &a, int b) { return a > b ? a = b, true : false; }
int maxeq(int &a, int b) { return a < b ? a = b, true : false; }
const int MAXN = 1e5 + 100;
int main() {
  ios_base::sync_with_stdio(false);
  string str;
  cin >> str;
  int res = 0;
  for (int i = 0; i < str.size(); i++) {
    int num;
    if (str[i] >= 'A' && str[i] <= 'Z')
      num = str[i] - 'A' + 1;
    else
      num = str[i] - 'a' + 1;
    int s = 0;
    if ('@' < str[i] && '[' > str[i]) s += num;
    if ('`' < str[i] && '{' > str[i]) s -= num;
    res = s + res;
  }
  cout << res;
  return 0;
}
