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() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int t;
  cin >> t;
  while (t--) {
    int n, m, a[1024], p, s = 0;
    cin >> n >> m;
    while (n--) {
      cin >> p;
      a[p] = -1;
    }
    while (m--) {
      cin >> p;
      if (a[p] == -1) {
        s = p;
      }
    }
    if (s) {
      cout << "YES" << endl;
      cout << 1 << " " << s << endl;
    } else {
      cout << "NO" << endl;
    }
  }
}
