open System
open System.Collections.Generic

[<AutoOpen>]
module Cin =
    let read f = stdin.ReadLine() |> f
    let reada f = stdin.ReadLine().Split() |> Array.map f
    let readChars() = read string |> Seq.toArray
    let readInts() = readChars() |> Array.map (fun x -> Convert.ToInt32(x.ToString()))

[<AutoOpen>]
module Cout =
    let writer = new IO.StreamWriter(new IO.BufferedStream(Console.OpenStandardOutput()))
    let print (s: string) = writer.Write s
    let println (s: string) = writer.WriteLine s
    let inline puts (s: ^a) = string s |> println

let solve() =
    let [| W; H; C |] = reada string
    let W = int W
    let H = int H

    let sym =
        if C = "B" then [| 'B'; 'W' |] else [| 'W'; 'B' |]
    for y in 0 .. H - 1 do
        let mutable buf = ""
        for x in 0 .. W - 1 do
            let i = (y + x) % 2
            let s = sym.[i]
            buf <- sprintf "%s%c" buf s
        puts buf

[<EntryPoint>]
let main _ =
    try
        solve()
    with e -> printfn "%s" (e.ToString())
    writer.Close()
    0 // return an integer exit code