import sys

def p(c):
	o = ord(c)
	if o > 96:
		return o-96
	else:
		return o-64+26

def gen():
	for line in sys.stdin:
		(l,r) = line[:len(line)//2], line[len(line)//2:-1]
		b = set(l) & set(r)
		yield list(b)[0]

print(sum(p(c) for c in gen()))