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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
str = input()
result = 0
for i in str:
    if 65 <= ord(i) <= 90:
        result = result + ord(i) - 64
    elif 97 <= ord(i) <= 122:
        result = result - ord(i) + 96
print(result)
