turn = int(input())
ans_set = set([int(i) for i in "0123456789"])

for t in range(turn):
    
    choice = list(map(str,input().split()))
    num_set = set([int(x) for x in choice[:4]])
    
    if choice[4] == "YES":
        ans_set = ans_set & num_set

    elif choice[4] == "NO":
        ans_set = ans_set - num_set

print(list(ans_set)[0])