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.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int t = sc.nextInt();
        for(; t >0 ; t--){
            int n = sc.nextInt();
            int m = sc.nextInt();
            int[] a = new int[n];
            int[] b = new int[m];
            Set<Integer> A = new HashSet<>();
            //Set<Integer> B = new HashSet<>();
            for (int i = 0 ; i<n ; i++) {
                a[i] = sc.nextInt();
                A.add(a[i]);
            }
            for (int i = 0 ; i<m ; i++) {
                b[i] = sc.nextInt();
                //B.add(b[i]);
            }
            boolean p = false;
            int tem = 0;
            for (int i = 0 ; i<m;i++){
                if (!A.add(b[i])){
                    p = true;
                    tem = b[i];
                    break;
                }
            }
            if (p){
                System.out.println("YES");
                System.out.println("1"+" "+tem);
            }
            else System.out.println("NO");
        }
    }
}

 		  			 	   	 			       	  		