#include <bits/stdc++.h>   using namespace std;   void fastIo() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);   }   int main() {     fastIo();     int q;     cin >> q;     while (q--) {       int n;       cin >> n;       string s;       cin >> s;       if (n == 1) {         cout <<  NO  << endl;       } else if (n == 2) {         if (s[0] >= s[1])           cout <<  NO  << endl;         else {           cout <<  YES  << endl;           cout <<  2  << endl;           cout << s[0] <<     << s[1] << endl;         }       } else {         cout <<  YES  << endl;         cout <<  2  << endl;         cout << s[0] <<    ;         for (int i = 1; i < n; i++) cout << s[i];         cout << endl;       }     }     return 0;   }   