#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int i, j, k, m, n, a[100400], t, w, q, sum = 0;
  char s[105000];
  long double x, y;
  cin >> q;
  for (j = 0; j < q; j++) {
    cin >> n;
    cin >> s;
    if (n > 2) {
      cout << "YES" << endl;
      cout << 2 << endl;
      cout << s[0] << " ";
      for (i = 1; i < n; i++) cout << s[i];
      cout << endl;
    } else {
      if (s[0] - '0' < s[1] - '0') {
        cout << "YES" << endl;
        cout << 2 << endl;
        cout << s[0] << " " << s[1] << endl;
      } else
        cout << "NO" << endl;
    }
  }
  return 0;
}
