#include #include using namespace std; using ll = long long int; using u64 = unsigned long long; using pll = pair; // #include // using namespace atcoder; #define REP(i, a, b) for (ll i = (a); i < (b); i++) #define REPrev(i, a, b) for (ll i = (a); i >= (b); i--) #define ALL(coll) (coll).begin(), (coll).end() #define SIZE(v) ((ll)((v).size())) #define REPOUT(i, a, b, exp, sep) REP(i, (a), (b)) cout << (exp) << (i + 1 == (b) ? "" : (sep)); cout << "\n" // @@ !! LIM() int main(/* int argc, char *argv[] */) { ios_base::sync_with_stdio(false); cin.tie(nullptr); cout << setprecision(20); ll H, W; cin >> H >> W; REP(i, 0, H) { if (i % 2 == 0) { REP(j, 0, W) { if (j % 4 <= 1) cout << "X"; else cout << "O"; } cout << "\n"; }else { REP(j, 0, W) { if (j % 4 <= 1) cout << "O"; else cout << "X"; } cout << "\n"; } } return 0; }