using System;

public class Program

{

    public static void Main()

    {

        int i,x,v, Length , countx=0 , countv=0;

        Length = int.Parse(Console.ReadLine());

        if(Length%2==0)

            Length++;

        int[] array = new int[Length];

        x = int.Parse(Console.ReadLine());

        v = int.Parse(Console.ReadLine());

        Console.WriteLine("Choose "+x+" or "+v+" or you're dead don't try me");

        for(i=0;i<array.Length;i++)

        {

            array[i] = int.Parse(Console.ReadLine()); 

        }

        for(i=0;i<array.Length;i++)

        {

            if(array[i]==x)

                countx++;

            else

                countv++;

        }

        if(countx > countv)

            for(i=0;i<array.Length;i++)

            {

                if(array[i]==x)

                    Console.Write(i+", ");

            }

        if(countv > countx)

            for(i=0;i<array.Length;i++)

            {

                if(array[i]==v)

                    Console.Write(i+", ");

            }

    }

}