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

import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class CommonSubsequences {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int t = sc.nextInt();
        while (t-- > 0) {
            int n = sc.nextInt();
            int m = sc.nextInt();
            int[] a = new int[n];
            int[] b = new int[m];
            int[] ans=new int[m];
            int c=0;
            for (int i = 0; i < n; i++) {
                a[i] = sc.nextInt();
            }
            for (int j = 0; j < m; j++) {
                b[j] = sc.nextInt();
            }
            for(int i=0;i<n;i++){
                for(int j=0;j<m;j++){
                    if(a[i]==b[j])
                        c++;
                }
            }
            Set<Integer> set1 = new HashSet<>();
            Set<Integer> set2 = new HashSet<>();
            for (int i : a) {
                set1.add(i);
            }
            for (int i : b) {
                set2.add(i);
            }
            set1.retainAll(set2);

            if(c==a.length && c==b.length){
                System.out.println("YES");
                System.out.print(1+" ");
                System.out.println(2);
            }

           else if(set1.size()>0 ){

                    System.out.println("YES");
                    System.out.print(set1.size() +" ");
                    System.out.println(set1.toString().replace("[", "").replace("]", "").replace(",",""));

            }
                    else if(c==a.length){
                System.out.println("YES");
                System.out.print(1+" ");
                System.out.println(a[1]);
            }

            else
                System.out.println("NO");
        }
    }
}






