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);