#!/usr/bin/env python3
from itertools import chain, islice

lines = (x.strip() for x in open("input.txt"))
s = 0

for line1, line2, line3 in (chain([first], islice(lines, 2)) for first in lines):
    i = set(line1).intersection(line2).intersection(line3)
    o = ord(i.pop())
    s += o - 0x60 if o > 0x60 else o - 38

print(s)