def lscan; gets.split.map(&:to_i); end

def fsqrt(x)
    Math.sqrt(x).to_i
end
def csqrt(x)
    Math.sqrt(x).ceil.to_i
end

n,k = lscan

abort if n == 0

rn = fsqrt(n)

if true
    c = n/(k*k)
    h = c*k
    rem = n - c*(k*k)
    h += csqrt(rem)
    p h
    m = n
    (n/(k*k)).times do |i|
        k.times do
            puts '.'*(k*i)+'#'*k+'.'*(h-(k*i+k))
        end
        m -= k*k
    end
    r = rem
    z = csqrt(rem)
    z.times do
        a = [0, [r, z].min].max
        b = z - a
        puts '.'*(k*(n/(k*k)))+'#'*a+'.'*b
        r -= z
    end
end