#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define srt(v) sort(v.begin(), v.end())
#define rsrt(v) sort(v.rbegin(), v.rend())
#define pb push_back

void solve(){
    int n; cin >> n;
    string s; cin >> s;
    set<string>st;
    bool chk=true;
    string s2= "SeriousOJ";
    int j=0;
    int cnt=0;
    for(int i=0; i<s.size(); i++){
        if(s[i]==s2[j]){
            j++;
            cnt++;
        }
    }
    if(cnt==9){
        cout << "YES\n";
    }else{
        cout << "NO\n";
    }
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int t; cin >> t;
    while(t--){
        solve();
    }
}