//#define _GLIBCXX_DEBUG #include <bits/stdc++.h> #define rep(i, n) for(int i=0; i<n; ++i) #define all(v) v.begin(), v.end() #define rall(v) v.rbegin(), v.rend() using namespace std; using ll = int64_t; using ld = long double; using P = pair<int, int>; using vs = vector<string>; using vi = vector<int>; using vvi = vector<vi>; template<class T> using PQ = priority_queue<T>; template<class T> using PQG = priority_queue<T, vector<T>, greater<T> >; const int INF = 0xccccccc; const ll LINF = 922337203685477580LL; template<typename T1, typename T2> inline bool chmax(T1 &a, T2 b) {return a < b && (a = b, true);} template<typename T1, typename T2> inline bool chmin(T1 &a, T2 b) {return a > b && (a = b, true);} template<typename T1, typename T2> istream &operator>>(istream &is, pair<T1, T2> &p) { return is >> p.first >> p.second;} template<typename T1, typename T2> ostream &operator<<(ostream &os, const pair<T1, T2> &p) { return os << p.first << ' ' << p.second;} //head int main() { ios::sync_with_stdio(false); cin.tie(0); int t; cin >> t; while(t--) { int n; string s; cin >> n >> s; bool win = false; bitset<1000> bits; rep(u, 2) { bits = 0; rep(i, n) { if(bits.test(i)) s[i] = 'o'; if(n-i >= 3) { if(s.substr(i, 3) == "oo-" or s.substr(i, 3) == "-oo" or s.substr(i, 3) == "o-o" or s.substr(i, 3) == "ooo") win = true; if(s.substr(i, 3) == "o--") bits.set(i+2); } if(n-i >= 4) { if(s.substr(i, 4) == "-o--" or s.substr(i, 4) == "--o-") win = true; } if(bits.test(i)) s[i] = '-'; } reverse(all(s)); } cout << (win?"O":"X") << '\n'; } }