#include <bits/stdc++.h>
using namespace std;
#define all(x) (x).begin(), (x).end()
#define rep(i, n) for(ll i=0; i<(ll)(n); i++)

template<typename T> bool chmax(T& a, T b) { return a<b ? a=b, true : false; }
template<typename T> bool chmin(T& a, T b) { return a>b ? a=b, true : false; }
using ll=long long; const int INF=1e9+10; const ll INFL=4e18;
using VI=vector<int>; using VVI=vector<VI>; using VL=vector<ll>; using VVL=vector<VL>;
using PL=pair<ll,ll>; using VP=vector<PL>; using WG=vector<vector<pair<int,ll>>>;

#ifdef LOCAL
#include "./debug.hpp"
#else
#define debug(...)
#define print_line
#endif


//----------------------------------------------------------

void solve() {
    int H,W; cin>>H>>W;

    rep(i,H) {
        string str="OX";
        if(i%2) swap(str[0],str[1]);
        rep(j,W) {
            if(j%4<=1) cout<<str[0];
            else cout<<str[1];
        }
        cout<<endl;
    }
}

int main() {
    ios::sync_with_stdio(false); cin.tie(nullptr);
    //cout<<fixed<<setprecision(15);
    int T=1; //cin>>T;
    while(T--) solve();
}