def write_coords(n):
    for i in range(n):
        for j in range(n):
            print(i, j, sep=",", end=" ")
        print()

def draw_square(n):
    for i in range(n):
        for j in range(n):
            print("#", sep=" ", end="")
        print() # jumps to new line

#def empty_square(n):
 
def pyramid(n):
    for i in range(n):
        for j in range(2*n-1):
            if (j < (n-1-i)) or (j >= (n + i)):
                print(".", sep=" ", end="")
            else:
                print("#", sep=" ", end="")
        print()

def write_ith_line(i,n):
    if i >= n / 2 :
        if n % 2 == 1:
            print(". " * (n//2),"# ",". " * (n//2),sep="")
        else:
            print(". " * (n//2),"# ",". " * (n//2 - 1),sep="")
    else:
        if n % 2 == 1:
            if i == (n//2):
                print(". " * i, "# ", ". " * i,sep="")
            else:
                print(". " * i, "# ", ". " * (n-2*i-2), "# ", ". " * i,sep="")
        else:
            print(". " * i, "# ", ". " * (n-2*i-2), "# ", ". " * i,sep="")



def write_y(n):
  for i in range(n):
      write_ith_line(i,n)

write_y(7)