import aocd

def solve(data):
    list_a, list_b = zip(*(map(int, line.split()) for line in data.split('\n')))
    return sum(num*list_a.count(num)*list_b.count(num) for num in set(list_a))

if __name__ == '__main__':
    solution = solve(aocd.get_data(year=2024, day=1))

    print(solution)
    aocd.submit(solution, year='2024', day=1, part='b')