# input
N = int(input())
A_D = []
R = []

in_l = []
for i in range(N):
	a,b,c,d,r = input().split()
	A_D.append([int(a), int(b), int(c), int(d)])
	R.append(r)

ans_l = [True for i in range(10)]

# YES → 答えの候補から、入力4つ以外のものを消す
# NO → 入力4つを消す
for i in range(N):
	if(R[i] == 'YES'):
		for j in range(10):
			if(not ans_l[j]):
				continue
			if(not(A_D[i][0] == j) and not(A_D[i][1] == j) and not(A_D[i][2] == j) and not(A_D[i][3] == j)):
				ans_l[j] = False

	else:
		for j in range(10):
			if(A_D[i][0] == j or A_D[i][1] == j or A_D[i][2] == j or A_D[i][3] == j):
				ans_l[j] = False

for j in range(10):
	if(ans_l[j]):
		print(j)
		exit()