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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
s=input()
ret=0
for a in s:
    b1=('@'<a and '['>a)
    b2=('`'<a and '{'>a)
    try:
        i1=b1*(string.ascii_lowercase.index(a.lower())+1)
        i2=b2*(string.ascii_lowercase.index(a.lower())+1)
    except:
        i1=0
        i2=0
    m=i1-i2
    ret+=m
print(ret)
