let ``No.69 文字を自由に並び替え``() =
  [ stdin.ReadLine() ; stdin.ReadLine() ]
  |> fun l -> (l.[0] |> Seq.sort) , (l.[1]  |> Seq.sort )
  |> fun (A, B)-> System.String.Join( "" , A |> Seq.toArray ) = System.String.Join( "" , B |> Seq.toArray )
  |> function 
     | true -> "YES"
     | false-> "NO"
  |> stdout.WriteLine

``No.69 文字を自由に並び替え``()