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;
bool was[10000], ansb;
int t, n, m, a, ans;
int main() {
  cin >> t;
  for (int j = 0; j < t; j++) {
    cin >> n >> m;
    for (int i = 0; i < n; i++) {
      cin >> a;
      was[a] = true;
    }
    for (int i = 0; i < m; i++) {
      cin >> a;
      if (was[a] == true) {
        ansb = true;
        ans = a;
      }
    }
    if (ansb) {
      cout << "YES" << endl << 1 << " " << ans << endl;
    } else {
      cout << "NO" << endl;
    }
    for (int i = 0; i <= 1000; i++) {
      was[i] = false;
    }
    ansb = false;
  }
}
