;;; File:  main.scm
;; Author: ymiyamoto
;;
;; Created on Mon Oct  7 02:32:46 2019
;;
(define-syntax read-number
  (syntax-rules ()
    ((_ nums)
     (define-values nums
       (apply values (map string->number (string-split (read-line) #\space)))))))

(define-syntax read-numbers
  (syntax-rules ()
    ((_ as)
     (define as (map string->number (string-split (read-line) #\space))))
    ((_ as n)
     (define as (map (lambda (_) (map string->number (string-split (read-line) #\space))) (iota n))))))

(define-syntax prlist
  (syntax-rules ()
    ((_ lis)
     (print (string-join (map number->string lis) " ")))))

(define-syntax 1+ (syntax-rules () ((_ x) (+ x 1))))

(define-syntax 1- (syntax-rules () ((_ x) (- x 1))))

(define MOD 1000000007)

(define (rotate i s)
  (define l (string->list s))
  (list->string (append (drop l i) (take l i))))

(define (solve)
  (read-number (n k))
  (cond ((<= n (* k k))
	 (let1 m (x->integer (ceiling (sqrt n)))
	       (print m)
	       (let loop ((i m)
			  (n n))
		 (when (> i 0)
		   (let1 l (min m n)
			 (print (string-append (make-string l #\#)
					       (make-string (- m l) #\.)))
			 (loop (1- i) (- n l)))))))
	(else
	 (let1 m (ceiling (/ n k))
	       (print m)
	       (let loop ((i 0)
			  (n n))
		 (when (< i m)
		   (let1 l (min k n)
			 (print (rotate i (string-append (make-string l #\#)
							 (make-string (- m l) #\.))))
			 (loop (1+ i) (- n l)))))))))

(solve)