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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 f(char c) {
  if (c >= 'a' && c <= 'z') return c - 'a' + 1;
  if (c >= 'A' && c <= 'Z') return c - 'A' + 1;
  return 0;
}
int main() {
  string s;
  cin >> s;
  long long r = 0;
  for (auto c : s) {
    bool b1 = ('@' < c) && ('[' > c);
    int v1 = b1 * f(c);
    bool b2 = ('`' < c) && ('{' > c);
    int v2 = b2 * f(c);
    r += v1 - v2;
  }
  cout << r << endl;
  return 0;
}
