#include <bits/stdc++.h>
using namespace std;

int main() {
    
    int t=1;
    cin>>t;
    while(t--){
        int n;
        cin>>n;
        if (n<9)
        {
            cout << " NO" << endl;
        }
        
        
        string s = "SeriousOJ";
        int j=0;
        for (int i = 0; i < n; i++)
        {
            char ch;
            cin>>ch;
            if (ch==s[j])
            {
                j++;
            }
            
        }
        
        if (j==9)
        {
            cout << "YES" << endl;
        }
        else
        {
            cout << " NO" << endl;
        }
        
        
        
    }


    return 0;
}