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