n=4
c=[[0 for j in range(n)] for i in range(n)]
from random import randrange
while 1:
  i=randrange(n)
  j=randrange(n)
  c[i][j]^=1
  f=1
  for i in range(n):
    for j in range(n):
      for dx,dy in [(1,0),(1,1),(0,1),(-1,1)]:
        g=0
        for k in range(3):
          g+=c[(i+dx*k)%n][(j+dy*k)%n]
        if g==0 or g==3:
          f=0
  if f:
    break
for i in range(n):
  for j in range(n):
    c[i][j]="OX"[c[i][j]]
H,W=3000,3000
b=[["O"]*W for i in range(H)]
for i in range(H//n):
  for j in range(W//n):
    for ii in range(n):
      for jj in range(n):
        b[i*n+ii][j*n+jj]=c[ii][jj]
h,w=map(int,input().split())
for i in range(h):
  print("".join(b[i][:w]))