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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
line = raw_input().strip()
res = 0
for ch in line:
    res += (ord(ch) - ord('A') + 1 if ch.isupper() else 0)
    res -= (ord(ch) - ord('a') + 1 if ch.islower() else 0)
print res
