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]);
            for (int i = 0; i < h; i++)
            {
                string str = "";
                string addstr = whc[2];
                if (addstr=="W")
                {
                    if (i % 2 == 1) 
                    {
                        addstr = "B";
                    }
                }
                else
                {
                    if (i % 2 == 1)
                    {
                        addstr = "W";
                    }
                }
                for (int j = 0; j < w; j++) 
                {
                    str = str + addstr;
                    if(addstr=="B")
                    {
                        addstr = "W";
                    }
                    else
                    {
                        addstr = "B";
                    }
                }
                Console.WriteLine(str);
            }
            
        }
    }
}