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;
void test() {
  int n, j;
  cin >> n >> j;
  map<int, int> m;
  int in;
  for (int i = 0; i < n; i++) {
    cin >> in;
    m[in]++;
  }
  for (int i = 0; i < j; i++) {
    cin >> in;
    m[in]++;
  }
  int flag = 0;
  for (auto c : m) {
    if (c.second > 1) {
      cout << "YES\n1 " << c.first << "\n";
      flag = 1;
      break;
    }
  }
  if (flag == 0) {
    cout << "NO"
         << "\n";
  }
}
int main() {
  int t;
  cin >> t;
  while (t--) {
    test();
  }
}
