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

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