#include<bits/stdc++.h>
using namespace std;
int32_t main() {
     ios_base::sync_with_stdio(false);
     cin.tie(0); cout.tie(0);
     int t; cin >> t;
     while (t--) {
        int n; cin >> n; 
        string s;
        cin >> s;
        string st;
        int idx = 0;
        for (int i = idx; i < s.size(); i++) {
          if (s[i] == 'S') {
            idx = i;
          st.push_back(s[i]);
          break;
          }
        }
        for (int i = idx; i < s.size(); i++) {
          if (s[i] == 'e') {
            idx = i;
          st.push_back(s[i]);
          break;
          }
        }
        for (int i = idx; i < s.size(); i++) {
          if (s[i] == 'r') {
            idx = i;
          st.push_back(s[i]);
          break;
          }
        }
        for (int i = idx; i < s.size(); i++) {
          if (s[i] == 'i') {
            idx = i;
          st.push_back(s[i]);
          break;
          }
        }
        for (int i = idx; i < s.size(); i++) {
          if (s[i] == 'o') {
            idx = i;
          st.push_back(s[i]);
          break;
          }
        }
        for (int i = idx; i < s.size(); i++) {
          if (s[i] == 'u') {
            idx = i;
          st.push_back(s[i]);
          break;
          }
        }
        for (int i = idx; i < s.size(); i++) {
          if (s[i] == 's') {
            idx = i;
          st.push_back(s[i]);
          break;
          }
        }
        for (int i = idx; i < s.size(); i++) {
          if (s[i] == 'O') {
            idx = i;
          st.push_back(s[i]);
          break;
          }
        }
        for (int i = idx; i < s.size(); i++) {
          if (s[i] == 'J') {
            idx = i;
          st.push_back(s[i]);
          break;
          }
        }

        if (st == "SeriousOJ") cout << "YES\n";
        else cout << "NO\n";
        
     }
}