import sys

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

def gen():
	for _ in range(100):
		g1 = next(sys.stdin)[:-1]
		g2 = next(sys.stdin)[:-1]
		g3 = next(sys.stdin)[:-1]
		b = set(g1) & set(g2) & set(g3)
		yield list(b)[0]

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