N = int(input())
li = [0]*10

for _ in range(N):
	a,b,c,d,r = map(str,input().split())
	S = {int(a),int(b),int(c),int(d)}
	if r[0] == "Y":
		for i in range(10):
			if i not in S:
				li[i] = -1
	else:
		for i in S:
			li[i] = -1

for i in range(10):
	if li[i] == 1:
		print(i)
		exit()