A = input()
B = input()
C = [0 for i in B]
for i in range(len(A)):
	for j in range(len(B)):
		if B[j]==A[i] and C[j]==0:
			C[j] = 1
			ans = 'YES'
			break
		ans = 'NO'
	if ans=='NO': break
print(ans)