#!/usr/bin/python3

occupied = set()
with open("input") as fh:
    for ln in fh:
        s = ln.strip()
        bin = s.replace("F", "0").replace("B", "1").replace("L", "0").replace("R", "1")
        num = int(bin, base=2)
        occupied.add(num)

for i in range(1024):
    if i not in occupied and i-1 in occupied and i+1 in occupied:
        print(i)