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() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  cout.tie(nullptr);
  int t, x = 0, y = 0, flag = 0, j, i;
  long long int s = 0;
  cin >> t;
  for (i = 0; i < t; i++) {
    flag = 0;
    cin >> x >> y;
    int a[x];
    int b[y];
    map<int, int> m;
    map<int, int> x1;
    map<int, int> x2;
    for (j = 0; j < x; j++) {
      cin >> a[j];
      m[a[j]]++;
      x1[a[j]]++;
    }
    for (j = 0; j < y; j++) {
      cin >> b[j];
      m[b[j]]++;
      x2[b[j]]++;
    }
    for (auto j : m) {
      if (j.second >= 2 && x1[j.first] >= 1) {
        flag = 1;
        cout << "YES"
             << "\n";
        cout << 1 << " " << j.first << "\n";
        break;
      }
    }
    if (flag == 0) {
      cout << "NO"
           << "\n";
    }
  }
}
