using System;

namespace MyCompiler {
    class Program {
        public static void Main(string[] args) {
            Console.WriteLine("Hello world!");
            string input = "#G@$OOD";
            char[] inputChar = input.ToCharArray();
            char[] output = new char[inputChar.Length];
            for(int i =0 ; i < input.Length; i++){
                if(Char.IsLetterOrDigit(inputChar[i])){
                    Console.WriteLine("if is true {0}", inputChar[i]);
                    Console.WriteLine("Value of i {0}", i);
                    output[input.Length - i] = inputChar[i];
                    
                }
                else {
                    Console.WriteLine("if is false {0}", inputChar[i]);
                    Console.WriteLine("Value of i {0}", i);
                    output[i]=inputChar[i];
                }
            }
            Console.WriteLine(String.Join(",", output));
        }
    }
}