using System;

namespace MyCompiler {
    class Program {
        public static void Main(string[] args) {
            Console.WriteLine("Hello world!");
            string result = "";
            string input = "aabbcc";
            foreach(var character in input){
                if(!result.Contains(character)){
                    result += character;
                }
            }
            Console.WriteLine("{0} New string", result);
        }
    }
}