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.Arrays;
import java.util.Scanner;

public class Solutions {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        while (n > 0) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            int[] arr = new int[a];
            int brr[] = new int[b];
            for (int i = 0; i < a; i++) {
                arr[i] = sc.nextInt();

            }
            for (int i = 0; i < b; i++) {
                brr[i] = sc.nextInt();

            }

            String str="NO";
            int arrr[] = new int[2];
            for (int i = 0; i < a; i++) {
                for (int j = 0; j < b; j++) {
                    if (arr[i] == brr[j]) {
                        str = "YES";
                        arrr[0] = 1;
                        arrr[1] = arr[i];
                        break;
                    }
                }
            }


            System.out.println(str);
            System.out.println(Arrays.toString(arrr));
            n--;
        }
    }
}







