n, k = read_line.split.map &.to_i
m = n >= k * k ? (n + k - 1)//k : Math.sqrt(n).ceil.to_i
ans = Array.new(m) { Array.new(m, '.') }
m.times do |i|
  {k, m}.min.times do |j|
    if n > 0
      ans[i][(i + j) % m] = '#'
      n -= 1
    end
  end
end
puts m, ans.map(&.join).join('\n')