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

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author WhysoseriousONI
 */
import java.util.*;
import java.io.*;

public class cf1382a {
    public static void main(String[] args) {
        Scanner ss=new Scanner(System.in);
        int t=ss.nextInt();
        while(t-->0)
        {
            int n=ss.nextInt(),m=ss.nextInt();
            HashMap<Integer,Integer>map=new HashMap<>();
            for(int i=0;i<n;i++)
            {
                int temp=ss.nextInt();
                if(map.containsKey(temp))map.put(temp, map.get(temp)+1);
                else map.put(temp, 1);
                   
            }
            for(int i=0;i<m;i++)
            {
                int temp=ss.nextInt();
                if(map.containsKey(temp))map.put(temp, map.get(temp)+1);
                else map.put(temp, 1);
                   
            }
            boolean cond=false;
            int ans=-1;
            for(int i=0;i<1000;i++)
            {
                if(map.containsKey(i)&& map.get(i)>=2)
                {
                    
                    ans=i;
                    cond=true;
                    break;
                }
            }
            if(cond)
            {
                System.out.println("YES");
                System.out.println("1 "+ans);
            }
            else
            {
                System.out.println("NO");
            }
        }
    }
}
