using System;
using System.Linq;

class Program82
{
    public static void Main(string[] args)
    {
        var line = Console.ReadLine().Split(' ').ToArray();
        var width = int.Parse(line[0]);
        var height = int.Parse(line[1]);
        var isWhite = line[2] != "B";
        for (int y = 0; y < height; y++)
        {
            string text = string.Empty;
            isWhite = !isWhite;
            var t = isWhite;
            for (int x = 0; x < width; x++)
            {
                t = !t;
                if (t)
                {
                    text += "W";
                }
                else
                {
                    text += "B";
                }
            }
            Console.WriteLine(text);
        }        
    }
}