#include #include #include #include #include #include #include #include #define rep(i, a, b) for (int i = int(a); i < int(b); i++) using namespace std; using ll = long long int; // NOLINT using P = pair; // clang-format off #ifdef _DEBUG_ #define dump(...) do{ cerr << __LINE__ << ":\t" << #__VA_ARGS__ << " = "; debug_print(__VA_ARGS__); } while(false) template void debug_print(const T &t, const Ts &...ts) { cerr << t; ((cerr << ", " << ts), ...); cerr << endl; } #else #define dump(...) do{ } while(false) #endif template vector make_v(size_t a, T b) { return vector(a, b); } template auto make_v(size_t a, Ts... ts) { return vector(a, make_v(ts...)); } template bool chmin(T &a, const T& b) { if (a > b) {a = b; return true; } return false; } template bool chmax(T &a, const T& b) { if (a < b) {a = b; return true; } return false; } template void print(const T& t, const Ts&... ts) { cout << t; ((cout << ' ' << ts), ...); cout << '\n'; } template void input(Ts&... ts) { (cin >> ... >> ts); } template istream &operator,(istream &in, T &t) { return in >> t; } struct Inf { template constexpr operator T() { return numeric_limits::max() / 2; } }; // clang-format on #include int main() { cin.tie(nullptr); ios::sync_with_stdio(false); int t; cin, t; const vector patterns = {"ooo", "o-o", "-oo", "oo-", "-o--", "--o-"}; const vector pattern_regex = {"o-(--)+o"}; rep(_, 0, t) { int n; string s; cin, n, s; bool ok = false; for (auto &pattern : patterns) { if (s.find(pattern) != string::npos) { ok = true; break; } } for (auto &pattern : pattern_regex) { regex re(pattern); if (regex_match(s, re)) { ok = true; break; } } print(ok ? 'O' : 'X'); } return 0; }