s = gets.chomp
ss = gets.chomp
c = Array.new(28)
i = 1
(("a")..("z")).each do |t|
  c[i] = s.count(t)
  i += 1
end
i = 1
(("a")..("z")).each do |t|
  unless (c[i] == ss.count(t))
    puts "NO"
    exit
  end
  i += 1
end
puts "YES"