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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 i in s[1:len(s)]:
	p1=1 if '@'<i else 0;
	p2=1 if '['>i else 0;
	p3=1 if '`'<i else 0;
	p4=1 if '{'>i else 0;
	p1=1 if p1==p2 and p1==1 else 0;
	p3=1 if p3==p4  and p4==1 else 0;

	if i.isupper():
		p5=ord(i)-64
	elif
'''
s=input()
ans=0;
for i in s:
	if i.isupper():
		ans+=ord(i)-64;
	elif i.islower():
		ans-=ord(i)-96;
print(ans)
