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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 pi = 3.14159265358979323846;
const long long mod = 1e9 + 7;
const long long N = 5e5;
string s;
long long res;
int main() {
  std::ios_base::sync_with_stdio(false);
  std::cin.tie(0);
  std::cout.tie(0);
  cin >> s;
  for (long long i = 0; i < (long long)s.size(); ++i) {
    if ('a' <= s[i] && 'z' >= s[i]) res -= (s[i] - 'a' + 1);
    if ('A' <= s[i] && 'Z' >= s[i]) res += (s[i] - 'A' + 1);
  }
  cout << res;
  return 0;
}
