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

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