function! s:output()
  let this = {'lines': []}

  function! this.append(line) abort
    call add(self.lines, a:line)
  endfunction

  function! this.build() abort
    return join(self.lines, "\n")
  endfunction

  return this
endfunction

function! s:main(input) abort
  let o = s:output()

  let a = a:input[0]
  let b = a:input[1]
  let sa = sort(split(a, '\zs'))
  let sb = sort(split(b, '\zs'))
  let r = (sa == sb) ? 'YES' : 'NO'

  call o.append(r)
  return o.build()
endfunction

let s:input = getline(1, '$')
enew
put =s:main(s:input)
2,$print