1
2 2
1 1
1 2
 1
1 3
3
1 2 3
 1
1 1
1000
1000
 1
2 2
2 2
2 2
 5
4 5
10 8 6 4
1 2 3 4 5
1 1
3
3
1 1
3
2
5 3
1000 2 2 2 3
3 1 5
5 5
1 2 3 4 5
1 2 3 4 5
 1
4 4
1 1 1 1
1 2 3 4
 1
2 3
1 1
1 2 3

YES
1 1
 YES
1 3
 YES
1 1000
 YES
1 2
 YES
1 4
YES
1 3
NO
YES
1 3
YES
1 1
 YES
1 1
 YES
1 1

#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  for (int i = 0; i < t; i++) {
    int n, m, arr[1000] = {}, c = 0, last = 0;
    cin >> n >> m;
    for (int j = 0; j < n + m; j++) {
      int temp;
      cin >> temp;
      arr[temp - 1]++;
      if (arr[temp - 1] > 1) {
        c++;
        last = temp;
      }
    }
    if (c == 0)
      cout << "NO" << endl;
    else
      cout << "YES" << endl << 1 << ' ' << last << endl;
  }
}
