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;
    cin >> n >> m;
    set<int> s;
    int k;
    for (int r = 0; r < n; r++) {
      cin >> k;
      s.insert(k);
    }
    int a = -1;
    for (int r = 0; r < m; r++) {
      cin >> k;
      int h1 = s.size();
      s.insert(k);
      if (h1 == s.size()) a = k;
    }
    if (a != -1)
      cout << "YES"
           << "\n"
           << 1 << " " << a << "\n";
    else
      cout << "NO"
           << "\n";
  }
}
