#!/usr/bin/env python
# 2022 - Advent Of Code 3

#file = 'input_example.txt'
file = 'input.txt'

prio = 0

with open(file, encoding="utf-8") as f:
    for line in f.readlines():
        half_len = int(len(line.strip()) / 2)
        str1 = line[:half_len]
        str2 = line[half_len:]
        common = list(set(str1).intersection(str2))
        num = ord(common[0])
        if num > 90:  # lower case
            prio += num - 96
        else:
            prio += num - 64 + 26

print(prio)