day5.py

#!/usr/bin/env python3

import os
import sys
import random

src = open("input.txt", "r").readlines()
src = [r.strip() for r in src]

ids = set()

for line in src:
    v = int(line.replace("B", "1").replace("F", "0").replace("R", "1").replace("L", "0"), 2)
    ids.add(v)

print(max(ids))

not_mine = set()

[not_mine.add(x) for x in range(min(ids), max(ids) + 1)]

print(not_mine.difference(ids))