turn = int(input())
ans = [int(i) for i in range(10)]

for t in range(turn):
    
    choice = list(map(str,input().split()))
    choice_num = [int(x) for x in choice[0:4]]
    choice_hit = choice[-1]

    new_ans = []
    
    if choice_hit == "YES":

        for cn in choice_num:
            if cn in ans:
                new_ans.append(cn)

        ans = new_ans

    elif choice_hit == "NO":

        for cn in choice_num:
            if cn in ans:
                ans.remove(cn)

print(ans[0])