using System;

public class Program

{

    public static string reverse(string inp) {

        string reversed = "";

        return reversed;

    }

    public static void Main()

    {

        string str = "a#45&89i0er";

        // reverse so that you don't touch the numbers but reverse the others.

        // for example in this case if you reverse str, you will get - re45i89&0#a

        string reversed = reverse(str);

        Console.WriteLine(reversed);

    }

}