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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()
ans=0
for i in range(len(str)):
    if ord(str[i])>=ord('A') and ord(str[i])<=ord('Z'):
        ans+=ord(str[i])-ord('A')+1
    elif ord(str[i])>=ord('a') and ord(str[i])<=ord('z'):
        ans-=ord(str[i])-ord('a')+1
print(ans)
