N = int(input())
list1 = []
possibule_numbers = set[0,1,2,3,4,5,6,7,8,9]
for _ in range(N):
	inputs = input().split()
	A,B,C,D,R = inputs[0],inputs[1],inputs[2],inputs[3],inputs[4]
	list1.append(([A,B,C,D],R))

def main(XX):
	for k in XX:
		numbers,answer = k
		if k == "YES":
			possibule_number &= set(numbers)
		else:
			possibule_number -= set(numbers)
	return possibule_numbers(0)
print(main(list1))