using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {   

        string input = "have a nice day";

        //Expected Output: "aaac d eehi nvy";

        string output = SortString(input);

        Console.WriteLine(output);

    }

    public static string SortString(string input)

    {

        int totalLength = input.Length;

        string output = "";

       string[] InputArray = input.Split(' ');

        int [] InputLength = null ; 

        for(int i=0 ; i<=InputArray.Length; i++)

            InputLength[i] = InputArray[i].Length;

            //sorting logic

            // separate string accoeding to InputLength 

        }

        return output;

    }

}