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 t, n, m;
vector<int> a, b;
int main() {
  cin >> t;
  while (t--) {
    cin >> n >> m;
    a = vector<int>(n), b = vector<int>(m);
    for (int i = 0; i < n; i++) {
      cin >> a[i];
    }
    for (int i = 0; i < m; i++) {
      cin >> b[i];
    }
    bool ok = false;
    for (auto i : a) {
      for (auto j : b) {
        if (i == j) {
          cout << "YES\n" << i << '\n';
          ok = true;
          break;
        }
      }
      if (ok) break;
    }
    if (!ok) cout << "NO\n";
  }
}
