#include <bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for (int i = a; i < b; i++)
using ll = long long;

int main() {
	int h, w;
	cin >> h >> w;
	vector<string> t{
		"OOXX",
		"XXOO",
	};
	vector<string> s(h, string(w, ' '));
	rep(i, 0, h) rep(j, 0, w) {
		int y = i % 2;
		int x = j % 4;
		s[i][j] = t[y][x];
	}
	rep(i, 0, h) cout << s[i] << endl;
}