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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

l = list(raw_input())

def char_position(letter):
	return  (int("@" < letter and "[" > letter) - int("`" < letter and "{" > letter)) * (ord(letter.lower())-96)

ans = map(char_position,l)
# print ans
ans = sum(ans)

print ans