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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
import string
a=raw_input()

def findindex(i):
    uppercase=string.uppercase
    lowercase=string.lowercase
    if i in uppercase:
        return uppercase.index(i)+1
    elif i in lowercase:
        return -(lowercase.index(i)+1)
    else:
        return 0
print sum([findindex(i) for i in a])

    