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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
#!/usr/bin/env python



def main():
    ords = list(map(ord, input()))
    positive = [o - ord('A') + 1 for o in ords if ord('@') < o < ord('[')]
    negative = [o - ord('a') + 1 for o in ords if ord('`') < o < ord('{')]

    print(sum(positive) - sum(negative))

if __name__ == '__main__':
    main()