#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  int h, w;
  cin >> h >> w;
  vector Grid(h, vector<char>(w));
  vector pattern(2, vector<char>(4));
  pattern = {
    { 'O', 'O', 'X', 'X' },
    { 'X', 'X', 'O', 'O' }
  };
  rep(i, h) rep(j, w) Grid[i][j] = pattern[i % 2][j % 4];
  rep(i, h) {
    rep(j, w) cout << Grid[i][j];
    cout << '\n';
  }
  return 0;
}