def q():
	A = list(input())
	B = list(input())

	A.sort()
	B.sort()

	if len(A) != len(B):
		return False

	for i in range(0,len(A)):
		if A[i] != B[i]:
			return False

	return True

if q() == True:
	print('YES')
else:
	print('NO')