using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yukicoderTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            string[] whc = input.Split(' ');
            int w = int.Parse(whc[0]);
            int h = int.Parse(whc[1]);
            string str = "";
            if (whc[2] == "W")
            {
                while (str.Length < w)
                {
                    str = str + "B" + "W";
                }
            }
            else
            {
                while (str.Length < w)
                {
                    str = str + "W" + "B";
                }
            }


            for (int i = 0; i < h; i++)
            {
                string temp = str.Substring(0, 1);
                str = str.Remove(0, 1);
                str = str + temp;
                if (int.Parse(whc[0]) % 2 == 1)
                {
                    Console.WriteLine(str.Remove(str.Length - 1, 1));
                }
                else
                {
                    Console.WriteLine(str);
                }

            }
            
        }
    }
}