N = int(input())
ans = {'1','2','3','4','5','6','7','8','9','0'}

for i in range(N):
	l_in = input().split()
	if l_in[4]=="NO":
		#print("NO", l_in[0:4])
		ans -= set(l_in[0:4])
	else:
		#print("YES", l_in[0:4])
		ans &= set(l_in[0:4])
for a in ans: print(a)