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

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