H,W=3000,3000
b=[["O"]*W for i in range(H)]
c=[["O","X","X"],["X","O","O"],["X","O","X"]]
for i in range(H//3):
  for j in range(W//3):
    for ii in range(3):
      for jj in range(3):
        b[i*3+ii][j*3+jj]=c[ii][jj]
h,w=map(int,input().split())
for i in range(h):
  print("".join(b[i][:w]))