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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
s = input()
ans = 0
abc = 'abcdefghijklmnopqrstuvwxyz'

val = {}
for i in range(len(abc)):
    val[abc[i]] = i+1
    
for i in s:
    if i == i.upper():
        try:
            ans += val[i.lower()]
        except:
            pass
    elif i == i.lower():
        ans -= val[i]

print(ans)        
