ids = []
with open('input.txt') as fh:
	for line in fh:
		ids.append(int(
			line.strip()\
				.replace('F', '0')\
				.replace('B', '1')\
				.replace('L', '0')\
				.replace('R', '1'),
			2
		))

print(max(ids))

state = 0b000
for i in range(2 << 10):
	state = (state >> 1) | ((i in ids) << 2)
	if state == 0b101:
		print(i - 1)