#include <bits/stdc++.h>   using namespace std;   void FLASH() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);   }   void SETF() {     cout.ios_base::setf(ios_base::fixed);     cerr.ios_base::setf(ios_base::fixed);   }   void UNSETF() {     cout.ios_base::unsetf(ios_base::fixed);     cerr.ios_base::unsetf(ios_base::fixed);   }   bool sortinrev(const pair<long long int, long long int> &a,                  const pair<long long int, long long int> &b) {     return (a.first > b.first);   }   long long int A[1000000];   long long int B[1000000];   map<int, vector<int> > node;   int main() {     FLASH();     long long int t;     cin >> t;     while (t--) {       string s;       long long int n;       cin >> n >> s;       if (n == 2) {         if (s[0] >= s[1])           cout <<  NO  << endl;         else           cout <<  YES  << endl << 2 << endl << s[0] <<     << s[1] << endl;       } else {         cout <<  YES  << endl;         cout << 2 << endl;         cout << s[0] <<    ;         for (long long int i = 1; i < n; i++) cout << s[i];         cout << endl;       }     }     return 0;   }   