# haru: pypy
import sys
input = sys.stdin.readline
II = lambda : int(input())
MI = lambda : map(int, input().split())
LI = lambda : [int(a) for a in input().split()]
SI = lambda : input().rstrip()
LLI = lambda n : [[int(a) for a in input().split()] for _ in range(n)]
LSI = lambda n : [input().rstrip() for _ in range(n)]
MI_1 = lambda : map(lambda x:int(x)-1, input().split())
LI_1 = lambda : [int(a)-1 for a in input().split()]

mod = 998244353
inf = 1001001001001001001
ordalp = lambda s : ord(s)-65 if s.isupper() else ord(s)-97
ordallalp = lambda s : ord(s)-39 if s.isupper() else ord(s)-97
yes = lambda : print("Yes")
no = lambda : print("No")
yn = lambda flag : print("Yes" if flag else "No")

prinf = lambda ans : print(ans if ans < 1000001001001001001 else -1)
alplow = "abcdefghijklmnopqrstuvwxyz"
alpup = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
alpall = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
URDL = {'U':(-1,0), 'R':(0,1), 'D':(1,0), 'L':(0,-1)}
DIR_4 = [[-1,0],[0,1],[1,0],[0,-1]]
DIR_8 = [[-1,0],[-1,1],[0,1],[1,1],[1,0],[1,-1],[0,-1],[-1,-1]]
DIR_BISHOP = [[-1,1],[1,1],[1,-1],[-1,-1]]
prime60 = [2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59]
sys.set_int_max_str_digits(0)
# sys.setrecursionlimit(10**6)
# import pypyjit
# pypyjit.set_param('max_unroll_recursion=-1')

from collections import defaultdict,deque
from heapq import heappop,heappush
from bisect import bisect_left,bisect_right
DD = defaultdict
BSL = bisect_left
BSR = bisect_right

# s 1 s
s = 220
n = 3 * s + 4
h = n // 2 - 2 # odd

assert h % 2 == 0

g1 = [["."] * n for i in range(n)] 
for i in range(2 * h):
    if i < h:
        p = i + 1
    else:
        p = i - h
    if p % 2 == 1:
        for j in range(2 * s + 1):
            g1[i][j] = "#"
    else:
        g1[i][s] = "#"

g2 = [["."] * n for i in range(n)] 
for i in range(1, 2 * h - 1):
    if i < h:
        p = i + 1
    else:
        p = i - h
    if p % 2 == 0:
        for j in range(2 * s + 1):
            g2[i][j] = "#"
    else:
        g2[i][s] = "#"

g3 = [["."] * n for i in range(n)]

for j in range(s + 2):
    g3[0][j] = "#"
    g3[0][3 * s + 3 - j] = "#"

for i in range(2 * h + 2):
    g3[i][0] = "#"
    g3[i][3 * s + 3] = "#"

for j in range(3 * s + 4):
    g3[2 * h + 1][j] = "#"



print(n)
for e in g1:
    print("".join(e))
for e in g2:
    print("".join(e))
for e in g3:
    print("".join(e))