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;
  while (t--) {
    int n, m, k, x;
    int a[1000] = {0};
    cin >> n >> m;
    for (int i = 0; i < n; i++) {
      cin >> k;
      a[k] = 1;
    }
    bool kt = false;
    for (int i = 0; i < m; i++) {
      cin >> k;
      if (a[k] == 1 and kt == false) {
        kt = true;
        x = k;
      }
    }
    if (kt) {
      cout << "YES\n1 " << x << endl;
    } else
      cout << "NO\n";
  }
  return 0;
}
