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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 main(void) {
  ios::sync_with_stdio(false);
  string s;
  cin >> s;
  long res = 0;
  for (const auto &ch : s) {
    bool c1 = '@' < ch;
    bool c2 = '[' > ch;
    bool c3 = '`' < ch;
    bool c4 = '{' > ch;
    bool a1 = c1 && c2;
    bool a2 = c3 && c4;
    long ai = (ch >= 'a' && ch <= 'z')   ? ch - 'a' + 1
              : (ch >= 'A' && ch <= 'Z') ? ch - 'A' + 1
                                         : 0;
    long t1 = long(a1) * ai;
    long t2 = long(a2) * ai;
    long m1 = t1 - t2;
    res += m1;
  }
  cout << res << endl;
}
