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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 double eps = 1e-12;
void ReadData() {
  string s;
  cin >> s;
  long long res = 0;
  s = ' ' + s;
  for (int i = 1; i <= ((int)s.size()) - 1; i++) {
    int fi = 0;
    if (s[i] >= 'A' && s[i] <= 'Z') fi = s[i] - 'A' + 1;
    int se = 0;
    if (s[i] >= 'a' && s[i] <= 'z') se = s[i] - 'a' + 1;
    res += fi - se;
  }
  cout << res << endl;
}
void Process() {}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  ReadData();
  Process();
}
