def part1():
    file = open("input.txt")

    questions = []
    sum = 0

    for line in file:

        if line == "\n":
            sum += len(set(questions))
            questions = []

        else:
            chars = list(line.strip())
            for char in chars:
                questions.append(char)

    sum += len(set(questions))

    print("Part 1: %d" % sum)


def part2():
    file = open("input.txt")

    questions = {}
    participants = 0

    sum = 0

    for line in file:

        if line == "\n":
            for question in questions:
                if questions[question] == participants:
                    sum += 1
            questions = {}
            participants = 0

        else:
            chars = list(line.strip())
            participants += 1
            for char in chars:
                if char in questions:
                    questions[char] += 1
                else:
                    questions[char] = 1

    for question in questions:
        if questions[question] == participants:
            sum += 1

    print("Part 2: %d" % sum)


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