HandShakes/disfavour			HandShakes/warnachinka
n	1	a = input()	n	1	x = input()
	2	F = []		2	y = []
	3	if a:		3	if x:
	4	F.append(set(eval(a)))		4	y.append(set(eval(x)))
	5	a = input()		5	x = input()
	6	while a:		6	while x:
	7	a = set(eval(a))		7	x = set(eval(x))
	8	flag = 0		8	mark = 0
				9	for i in tuple(y):
				10	if not i.isdisjoint(x):
				11	mark += 1
				12	if mark == 1:
				13	i.update(x)
				14	t = i
				15	else:
				16	t.update(i)
				17	y.remove(i)
				18	if mark == 0:
				19	y.append(x)
				20	x = input()
				21	if len(y) != 1:
				22	print("NO")
				23	else:
				24	print("YES")
	9			25
t	10	for item in tuple(F):	t
	11
	12	if not item.isdisjoint(a):
	13	flag += 1
	14
	15	if flag == 1:
	16	item.update(a)
	17	tmp = item
	18
	19	else:
	20	tmp.update(item)
	21	F.remove(item)
	22
	23	if flag == 0:
	24	F.append(a)
	25	a = input()
	26	if len(F) == 1:
	27	print("YES")
	28	else:
	29	print("NO")
	30

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