#!/usr/bin/python3
import sys

priority = {}
p = 1
for c in 'abcdefghijklmnopqrstuvwxyz':
	priority[c] = p
	p += 1
for c in 'ABCDEFGHIJKLMNOPQRSTUVWXYZ':
	priority[c] = p
	p += 1

total = 0
lines = sys.stdin.readlines()
for i in range(0, len(lines), 3):
	first = set(list(lines[i].rstrip()))
	second = set(list(lines[i+1].rstrip()))
	third = set(list(lines[i+2].rstrip()))
	inter = first & second & third
	total += priority[inter.pop()]

print(total)