#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll MOD = 1e9+7;
void solve() {
ll n; string s; cin >> n >> s;
string check = "seriousoj";
ll cnt = 0;
transform(s.begin(), s.end(), s.begin(), ::tolower);
for(ll i=0, j=0; i<s.size() && j<check.size(); ) {
if(s[i] == check[j]) {
i++; j++; cnt++;
}
else i++;
}
cout << (cnt == 9 ? "YES\n" : "NO\n");
}
int32_t main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL); cout.tie(NULL);
ll t = 1;
cin >> t;
while(t--) {
solve();
}
return 0;
}