def main():

	A = input()
	B = input()

	count = 0

	A_list = list(A)
	B_list = list(B)

	A_list.sort()
	B_list.sort()


	for i in range(len(A_list)):
		if(A_list[i] == B_list[i]):
			count += 1

	if(count == len(A_list)):
		print("YES")
	else:
		print("NO") 

if __name__ == '__main__':
	main()