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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

txt = raw_input().strip()
A = ord('@')
B = ord('[')
C = ord('`')
D = ord('{')

sm = 0
for c in txt:
	v = ord(c)
	#u1 = A < v
	#u2 = B > v

	#d1 = C < v
	#d2 = C > v

	low, upp = False, False
	if c in string.lowercase:
		idx = v - ord('a') + 1
		sm -= idx
	elif c in string.uppercase:
		idx = v - ord('A') + 1
		sm += idx

print sm
