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 = {};
  int n = {};
  int m = {};
  int value = {};
  bool test = {};
  int in = {};
  cin >> t;
  while (t--) {
    cin >> n >> m;
    test = false;
    std::vector<int> c(1001, 0);
    for (int i = 0; i < n; i++) {
      cin >> value;
      if (c[value] == 0) {
        c[value]++;
      }
    }
    for (int i = 0; i < m; i++) {
      cin >> value;
      c[value]++;
    }
    for (int i = 0; i < c.size(); i++) {
      if (c[i] > 1) {
        test = true;
        in = i;
        break;
      }
    }
    if (test == true) {
      cout << "YES" << endl;
      cout << 1 << " " << in << endl;
    } else if (test == false) {
      cout << "NO" << endl;
    }
  }
  return 0;
}
