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;
signed main() {
  long long int t;
  cin >> t;
  while (t--) {
    long long int n, m;
    cin >> n >> m;
    long long int arr[1001] = {0};
    for (long long int i = 0; i < n; i++) {
      long long int x;
      cin >> x;
      arr[x]++;
    }
    bool ans = true;
    for (long long int i = 0; i < m; i++) {
      long long int x;
      cin >> x;
      if (arr[x] > 0 && ans) {
        cout << "YES" << endl;
        cout << 1 << " " << x << endl;
        ans = false;
      }
    }
    if (ans) cout << "NO" << endl;
  }
}
