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();
    while(t-- >0){
        int n = sc.nextInt();
        int m = sc.nextInt();
        Set<Integer> arr = new HashSet<Integer>();
        for(int i =0; i<n;i++){
            arr.add(sc.nextInt()) ;
        }
        boolean b = false;
        for(int i = 0; i< m;i++){
            int temp = sc.nextInt();
            if(arr.contains(temp)){
                System.out.println("YES");
                System.out.println("1" + " "+ temp);
                b = true;
                break;
                
            }
        }
        if(!b){
            System.out.println("NO");
        }
    }
    }
}