HandShakes/kabaczek			HandShakes/avakiri
n	1	set_inp = input()	n	1	init1 = input()
	2	set_list = []
	3	if set_inp:
	4	set_list.append(set(eval(set_inp)))
	5			2
n	6	set_inp = input()	n	3	sets = []
	7	while set_inp:		4	if init1:
				5	sets.append(set(eval(init1)))
				6
				7	cur = input()
				8	while cur:
	8	cur_set = set(eval(set_inp))		9	cur = set(eval(cur))
	9	new_set_list = []		10	new_sets = []
	10	for s in set_list:		11	for el in sets:
	11	if cur_set.intersection(s):		12	if el.intersection(cur):
	12	cur_set = s.union(cur_set)		13	cur = cur.union(el)
	13	else:		14	else:
n	14	new_set_list.append(s)	n	15	new_sets.append(el)
				16	new_sets.append(cur)
				17	sets = new_sets.copy()
				18	cur = input()
	15			19
t	16	new_set_list.append(cur_set)	t
	17	set_list = new_set_list.copy()
	18	set_inp = input()
	19
	20	if len(set_list) > 1:		20	if len(sets) > 1:
	21	print('NO')		21	print('NO')
	22	else:		22	else:
	23	print('YES')		23	print('YES')
	24			24

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