#! /usr/bin/env python3


def iter_groups():
    group_responses = []
    with open("input.txt") as f:
        for line in f:
            line = line.strip()
            if line == "":
                # Group divider
                yield group_responses
                group_responses = []
            else:
                group_responses.append(line)
        else:
            if group_responses:
                yield group_responses


def part1():
    total = 0
    for group in iter_groups():
        questions = set()
        for person in group:
            for question in person:
                questions.add(question)
        total += len(questions)
    print("Total", total)


def part2():
    total = 0
    for group in iter_groups():
        result = set(group[0])
        for person in group[1:]:
            result = result & set(person)
        total += len(result)
    print("Total", total)


if __name__ == "__main__":
    part1()
    part2()