w, h, c = gets.split
w = w.to_i
h = h.to_i

d = "BW".tr(c, "")
e = c + d
l1 = w.even? ? e * (w / 2) : e * (w /2) + c
l2 = l1[1..] + l1[-1].tr("BW", "WB")

a, b = h.divmod(2)
a.times do |i|
    puts l1
    puts l2
end
b.times do |j|
    puts l1
end