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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
for c in S:
  if c.isalpha():
    if c.isupper():
      ans += ord( c ) - ord( '@' )
    else:
      ans -= ord( c ) - ord( '`' )
print( ans )
