def strtolist(s):
	lst = []
	for i in range(0, len(s)):
		lst.append(s[i])
	return lst

def judge(a, b):
	if a == b:
		return 'YES'
	else:
		return 'NO'

a = strtolist(raw_input())
a.sort()
b = strtolist(raw_input())
b.sort()
print judge(a, b)