MroC3/sver			MroC3/warnachinka
t	1	import re	t	1	import re
	2	a = []		2	a = []
	3	b = input()		3	b = input()
	4	while b:		4	while b:
	5	a.append(b)		5	a.append(b)
	6	b = input()		6	b = input()
	7	for i in range(len(a)):		7	for i in range(len(a)):
	8	a[i] += "\n"		8	a[i] += "\n"
	9			9
	10	for i in range(len(a) - 1):		10	for i in range(len(a) - 1):
	11	a[0] += a[i+1]		11	a[0] += a[i+1]
	12			12
	13	if len(re.findall("class", a[0])) < 2:		13	if len(re.findall("class", a[0])) < 2:
	14	print("Yes")		14	print("Yes")
	15	else:		15	else:
	16	try:		16	try:
	17	exec(a[0])		17	exec(a[0])
	18	print("Yes")		18	print("Yes")
	19	except TypeError:		19	except TypeError:
	20	print("No")		20	print("No")
	21	except ZeroDivisionError:		21	except ZeroDivisionError:
	22	pass		22	pass
	23	print("Yes")		23	print("Yes")
	24			24

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