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;
    map<int, bool> a, b;
    vector<int> va(n), vb(m);
    for (int i = 0; i < max(n, m); i++) {
      a[i] = false;
      b[i] = false;
    }
    for (int i = 0; i < n; i++) {
      int ai;
      cin >> ai;
      a[ai] = true;
      va[i] = ai;
    }
    for (int i = 0; i < m; i++) {
      int bi;
      cin >> bi;
      b[bi] = true;
      vb[i] = bi;
    }
    if (n < m) {
      for (int i = 0; i < n; i++) {
        if (b[va[i]]) {
          cout << "YES"
               << "\n";
          cout << 1 << " " << va[i] << "\n";
          break;
        }
      }
      cout << "NO"
           << "\n";
    } else {
      for (int i = 0; i < m; i++) {
        if (a[vb[i]]) {
          cout << "YES"
               << "\n";
          cout << 1 << " " << vb[i] << "\n";
          break;
        }
      }
      cout << "NO"
           << "\n";
    }
  }
}
