using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        string input = "123@ world";

        Console.WriteLine(PerformReverseAlgorithm(input));

    }

    public static string Reverse(string input)

    {

        List<string> list = input.Split(' ').Reverse().ToList();

        List<string> result = new List<string>();

        foreach (var item in list)

        {

            result.Add(new String(item.Reverse().ToArray()));

        }

        return String.Join(" ", result);            

    }

    public static string PerformReverseAlgorithm(string input)

    {

        List<string> list = input.Split(' ').ToList();

        List<string> result = new List<string>();

        foreach(string option in list)

        {

            char[] arr = option.ToCharArray();

            char[] res = new char[arr.Length];

            for(int i= 0; j = arr.Length; i < arr.Length; i++; j--)

            {

                res[i] = arr[j];

            }

        }

        return String.Join(" ", result);     

    }

}