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;
    cin >> n >> m;
    int a[1000];
    for (int i = 0; i < 1001; i++) {
      a[i] = 0;
    }
    int p = 1;
    int q = 0;
    for (int i = 0; i < n; i++) {
      int l;
      cin >> l;
      a[l] = 1;
    }
    for (int i = 0; i < m; i++) {
      int l;
      cin >> l;
      if (a[l] == 1) {
        p = 0;
        q = l;
        break;
      }
    }
    if (p == 0) {
      cout << "YES"
           << "\n";
      cout << 1 << " " << q << "\n";
    } else
      cout << "NO"
           << "\n";
  }
  return 0;
}
