# coding: utf-8 # Your code here! import sys readline = sys.stdin.readline read = sys.stdin.read n = int(readline()) nset = set() yset = set(range(10)) for _ in range(n): *r, = readline().split() s = set(map(int,r[:4])) if r[-1]=="NO": nset |= s else: yset &= s for i in yset: if i not in nset: print(i)