s1=STDIN.gets.chomp
s2=STDIN.gets.chomp
as=[]
bs=[]
s1.size.times do |i|
	as<<s1[i]
end
as=as.sort()
s2.size.times do |i|
	bs<<s2[i]
end
bs=bs.sort()
if as==bs
	puts "YES"
else
	puts "NO"
end