using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Test(1,0));

        Console.WriteLine(Test(2,0));

        Console.WriteLine(Test(2,1));

        Console.WriteLine(Test(3,0));

    }

    public static string Test(int a, int b)=> a switch

        {

                1 =>"c",

                2 or _ when (b == 1) => "d",

                _=> "e"

    };

}