N = int(input())
L1 = [l for l in range(10)]
L3 = []
n = 0
for x in range(N):
	L2 =  [y for y in input().split()]
	for y in range(len(L2))[:-1]:
		if L2[-1] == "YES":
			L3.append(int(L2[y]))
		else:
			if  int(L2[y]) in L1:
				del L1[L1.index(int(L2[y]))]
if len(L1) == 1:
	print(L1[0])
else:
	for y in L1:
		if L3.count(y) > n:
			n = L3.count(y)
			A = y
	print(A)