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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
def f(c):
    if ord('a') <= ord(c) and ord(c) <= ord('z'): return ord(c) - ord('a') + 1;
    elif ord('A') <= ord(c) and ord(c) <= ord('Z'): return -(ord(c) - ord('A') + 1)
    else : return 0;

print -sum([f(c) for c in raw_input()])