/* -*- coding: utf-8 -*-
 *
 * 3232.cc:  No.3232 Not Tic Tac Toe - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* main */

int main() {
  int h, w;
  scanf("%d%d", &h, &w);
  
  for (int i = 0; i < h; i++) {
    for (int j = 0; j < w; j++) {
      char c = ((i + (j >> 1)) & 1) ? 'X' : 'O';
      putchar(c);
    }
    putchar('\n');
  }

  return 0;
}