n,K=map(int,input().split())
l=(n+K*K-1)//(K*K)
a=[list("."*(l*K)) for i in range(l*K)]
for k in range(0,l*K,K):
  for i in range(K):
    for j in range(K):
      a[k+i][k+j]="#"
d=K*K*l-n
while d>0:
  for i in range(len(a[-1])):
    if a[-1][~i]=="#" and d>0:
      d-=1
      a[-1][~i]="."
    else:
      break
  else:
    a.pop()
  if d==0:
    break
  for i in range(len(a)):
    if a[~i][-1]=="#" and d>0:
      d-=1
      a[~i][-1]="."
    else:
      break
  else:
    for i in range(len(a)):
      a[i].pop()
  if d==0:
    break
for i in range(len(a)):
  print("".join(a[i]))