n=int(input())
L=[list(input().split()) for _ in range(n)]
Y,N={str(i) for i in range(10)},set()
for i in range(n):
	if L[i][-1]=="YES":
		Y&=set(L[i][:-1])
	else:
		N|=set(L[i][:-1])
print(*(Y-N))