using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;

namespace yukicoder_contest_312
{
    class _3
    {
        static void Main (string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            string[] inA = Regex.Split(Console.ReadLine(), "[ ]");
            int[] a = new int[n];
            for (int i = 0; i <= n - 1; i++) a[i] = int.Parse(inA[i]);

            int turn = 0;
            string output;

            while(true)
            {
                a[turn] = process(a[turn]);
                Console.WriteLine(a[turn]);
                //Thread.Sleep(1000);

                int judge = a[0];
                foreach (int i in a)
                {
                    if (i > judge) judge = i;
                }

                if (judge == 1)
                {
                    if (turn % 2 == 0)
                    {
                        output = "white";
                        break;
                    }
                    else
                    {
                        output = "black";
                        break;
                    }
                }
                else
                {
                    if (turn == a.Length - 1) turn = 0;
                    else turn++;
                }

            }
            Console.WriteLine(output);
        }

        static int process (int num)
        {
            int output = 1;

                for (int i = 2; i <= num; i++)
                {
                    if (num % i == 0)
                    {
                        if ((num / i) % 2 != 0)
                        {
                            if (output < num / i)
                            {
                                output = num / i;
                            }
                        }
                    }
                }
            return output;
        }
    }
}