#include<bits/stdc++.h>
using namespace std;
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

//o-set
template<typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

//debugging tool
template<typename T>
void debug(string name, T value) {
    cerr << name << " = " << value << endl;
}

template<typename T, typename U>
void debug(string name, pair<T, U> value) {
    cerr << name << " = {" << value.first << ", " << value.second << "}" << endl;
}

template<typename T>
void debug(string name, vector<T> v) {
    cerr << name << " =[ ";
    for (size_t i = 0; i < v.size(); i++) {
        if (i) {
            cerr << ", ";
        }
        cerr << v[i];
    }

    cerr << "]" << endl;
}

template<typename T>
void debug(string name, set<T> v) {
    cerr << name << " =[ ";
    for (auto it = v.begin(); it != v.end(); it++) {
        if (it != v.begin()) {
            cerr << ", ";
        }
        cerr << *it;
    }

    cerr << "]" << endl;
}



template<typename T, typename U>
void debug(string name, map<T, U> v) {
    cerr << name << " =[ ";
    for (auto it = v.begin(); it != v.end(); it++) {
        if (it != v.begin()) {
            cerr << ", ";
        }
        cerr << it->first << ": " << it->second;
    }

    cerr << "]" << endl;
}

#define DEBUG(x)        debug(#x, x);

#define int             long long
#define endl            "\n"
#define rep(i, a, b)    for (int i = a; i < b; i++)
#define fr(i, a, b)    for (int i = a; i <= b; i++)

typedef vector<int>     vi;















void solve() {
    int n;                          cin >> n;
    string s;           cin >> s;

    string ok = "SeriousOJ";

    int curid = 0;
    rep (i, 0, ok.size()) {
        char paitehbe = ok[i];

        bool paisi = 0;
        rep (j, curid , n) {
            if (s[j] == paitehbe) {
                paisi = 1;
                curid = j;
                break;
            }
        }

        if (!paisi) {
            cout << "NO\n";
            return;
        }
    }

    cout << "YES\n";
}



signed main() {
    ios_base::sync_with_stdio(false);cin.tie(0);

    int tt;     cin >> tt;
    
    while (tt--) 
        solve();
    
}