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.io.*;
import java.util.*;
public class Subsequence
{
    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];
            for(int i=0;i<n;i++)
            {
                a[i]=sc.nextInt();
            }
            for(int i=0;i<m;i++)
            {
                b[i]=sc.nextInt();
            }
            int d=0;
            for(int i=0;i<n;i++)
            {
               for(int j=0;j<m;j++)
               {
                   if(a[i]==b[j])
                   {
                       d++;
                       System.out.println("YES");
                       System.out.print(1+" "+a[i]);
                       break;
                   }
                   if(d>0)
                    break;
                }
            }
            if(d==0)
                System.out.println("NO");
        }
    }
}