using System;

public class Program

{

    static String wordReverse(String str) 

{ 

    int i = str.Length - 1; 

    int start, end = i + 1; 

    String result = ""; 

    while(i >= 0) 

    { 

        if(str[i] == ' ') 

        { 

            start = i + 1; 

            while(start != end) 

                result += str[start++]; 

            result += ' '; 

            end = i; 

        } 

        i--; 

    } 

    start = 0; 

    while(start != end) 

        result += str[start++]; 

    return result; 

} 

// Driver code 

public static void Main() 

{ 

    String str = "I AM A NEON BOI"; 

    Console.Write(wordReverse(str)); 

} 

}