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() {
  long long t, i, n, m, j, a;
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  cin >> t;
  while (t--) {
    vector<long long> a, b, c;
    long long g, h;
    cin >> n >> m;
    for (i = 0; i < n; i++) {
      cin >> g;
      a.push_back(g);
    }
    for (i = 0; i < m; i++) {
      cin >> h;
      b.push_back(h);
    }
    for (i = 0; i < n; i++) {
      for (j = 0; j < m; j++) {
        if (a[i] == b[j]) {
          c.push_back(a[i]);
          break;
        }
      }
    }
    if (c.size() > 1) {
      cout << "YES" << '\n';
      cout << 2 << " ";
      for (i = 0; i < 2; i++) {
        cout << c[i] << " ";
      }
      cout << '\n';
    } else if (c.size() == 1) {
      cout << "YES" << '\n';
      cout << 1 << " " << c[0] << '\n';
      ;
    } else {
      cout << "NO" << '\n';
    }
  }
}
