func main()
	var _: [][]char :: cui@input().split(" ")
	var W: int :: _[0].toInt(&)
	var H: int :: _[1].toInt(&)
	var C: char :: _[2][0]
	var C2: char :: C = 'B' ?('W', 'B')
	for h(1, H)
		for w(1, W)
			do cui@print("\{(h + w) % 2 = 0 ?(C, C2)}")
		end for
		do cui@print("\n")
	end for
	var ans: int
end func