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 A_1382A
{
    public static void main(String args[])
    {
        Scanner sc=new Scanner(System.in);
        int t=sc.nextInt();
        while(t--!=0)
        {
        int n1=sc.nextInt();
        int n2=sc.nextInt();
        int arr1[]=new int[n1];
        int arr2[]=new int[n2];
        for(int i=0;i<n1;i++)
        {
            arr1[i]=sc.nextInt();
        }
         for(int i=0;i<n2;i++)
        {
            arr2[i]=sc.nextInt();
        }
        int flag=0;
        for(int i=0;i<n1;i++)
        {
            for(int j=0;j<n2;j++)
            {
                if(arr1[i]==arr2[j])
                {
                    System.out.println("YES");
                     System.out.println("1 "+arr1[i]);
                     flag=1;
                     break;
                }
            }
        }
        if(flag==0)
        {
             System.out.println("NO");
        }
        }
        
        
    }
}