using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

    interface ICondition

    {

       string Operator{get;}

       ICondition Left{get;}

       ICondition Right{get;}

    }

    abstract class Condition: ICondition

    {

      public abstract string Operator{get;}

      public ICondition Left{get;}

      public ICondition Right{get;}

      public override string ToString()

      {

         return $"{this.Left}{this.Operator}{this.Right}";

      }

       public Condition(ICondition left,

                        ICondition right)

       {

           this.Left=left;

           this.Right=right;       

       }

    }

    class AndCondition: Condition

    {

       public override string Operator=>"AND";

       public AndCondition(ICondition left,

                        ICondition right)

            :base(left,right)

        {

        }

    }

    class OrCondition: Condition

    {

       public override string Operator=>"OR";

       public OrCondition(ICondition left,

                        ICondition right)

            :base(left,right)

       {

       }

    }

}