boarding_passes = []

with open('day5/input') as reader:
    boarding_passes.extend(reader.read().splitlines())


def seat_id(boarding):
    binary = boarding \
        .replace('F', '0') \
        .replace('B', '1') \
        .replace('L', '0') \
        .replace('R', '1')

    return int(binary, 2)


res = max(map(seat_id, boarding_passes))

print(res)

# second part
all_seats = sorted(map(seat_id, boarding_passes))
for i in range(len(all_seats)):
    if all_seats[i] + 2 == all_seats[i + 1]:
        print(all_seats[i] + 1)
        break