// Online C++ compiler to run C++ program online
#include <bits/stdc++.h>
 
using namespace std;
 
bool postojiDupli(vector<char>& arr) {
 
 
    unordered_set<char> s;
    for (char x : arr) {
        if (s.find(x) != s.end())
            return true;
        s.insert(x);
    }
    return false;
}
 
int main() {
    int t;
    cin >> t;
    while(t--){
        int n;
        string s;
        cin >> n >> s;
        vector<char> niz(n-2);
        for (int i = 0; i < n-2; i++){
             niz.push_back(s[i+1]);
        }
        for (int i = 0; i < n-2; i++){
             cout << niz[i] << " ";
        }
 
        if (postojiDupli(niz)){
            cout << "YES" << '\n';
        }
        else cout << "NO" << '\n';
 
    }
 
    return 0;
}

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3
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3
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