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.*;
 import java.lang.*;
 import java.io.*;

 public class s {
	public static void main( String[] args ) {
		Scanner sc= new Scanner(System.in);
		int cases=0;
		if(sc.hasNext())
		cases=sc.nextInt();
		while(cases>0){
		cases--;
		int n=sc.nextInt();
		int m=sc.nextInt();
		int[]a1=new int[n];
		int[]a2=new int[m];
	
	    for(int i=0;i<n;i++){
	        a1[i]=sc.nextInt();
	        }
	        
	    for(int j=0;j<m;j++){
	        a2[j]=sc.nextInt();
	        
	        }
	        int count=0;
	        for(int i=0;i<n;i++){
	             for(int j=0;j<m;j++){
	               if( a1[i]==a2[j]){
	                System.out.println("YES");
	                count=1;
	                System.out.println("1 "+String.valueOf(a1[i]));
	                break;
	        }
	        if(count==1){
	             break;
	        }
	    }
	  }
	  if(count==0){
	       System.out.println("NO");
	  }
	}
}
}
