using System;

using System.Text;                  

public class Program

{

    public static void Main()

    {

        string str ="Arun Kumar P P";

        GetReverseOrder(str);

    }   

    private static void GetReverseOrder( string str){   

​

    int i;  

    StringBuilder reverseSentence = new StringBuilder();  

    int Start = str.Length - 1;  

    int End = str.Length - 1;  

    while (Start > 0)  

    {  

        if (str[Start] == ' ')  

        {  

            i = Start + 1;  

            while (i <= End)  

            {  

                reverseSentence.Append(str[i]);  

                i++;  

            }  

            reverseSentence.Append(' ');  

            End = Start - 1;  

        }  

        Start--;  

    }  

    for (i = 0; i <= End; i++)  

    {  

        reverseSentence.Append(str[i]);  

    }  

    Console.WriteLine(reverseSentence.ToString());  

​

    }   

}