HiddenText/Stephan			HiddenText/yervandsargsyan
n	1	x = input()	n	1	first = input()
	2	y = input()		2	second = input()
	3	z = False		3	isit = False
	4			4
n	5	if len(y) > len(x):	n	5	if len(second) > len(first):
	6	print("NO")		6	print("NO")
n	7	elif len(y) == 0:	n	7	elif len(second) == 0:
	8	print("YES")		8	print("YES")
n	9	elif len(y) == 1:	n	9	elif len(second) == 1:
	10	if y in x:		10	if second in first:
	11	print("YES")		11	print("YES")
	12	else:		12	else:
	13	print("NO")		13	print("NO")
	14	else:		14	else:
n	15	for i in range(len(x)):	n	15	for i in range(len(first)):
	16	if z:		16	if isit:
	17	break		17	break
n			n	18	#if first[i]==second[0]: print(first[i], second[0])
	18	if x[i] == y[0]:		19	if first[i] == second[0]:
	19	for k in range(i+1, len(x)):		20	for j in range(i+1, len(first)):
				21	# print(j)
	20	if z:		22	if isit:
	21	break		23	break
n	22	if x[k] == y[1]:	n	24	if first[j] == second[1]:
				25	# print("AAA")
	23	j = k-i		26	k = j-i
				27	third = first[i:i+k*(len(second)):k]
				28	if third == second:
				29	isit = True
				30	if isit:
				31	print("YES")
				32	else:
				33	print("NO")
	24			34
t	25	p = x[i:i+j*(len(y)):j]	t
	26
	27	if p == y:
	28	z = True
	29
	30	if z:
	31	print('YES')
	32	else:
	33	print('NO')
	34

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