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();
		
		for(int i=0;i<t;i++) {
		    int n=sc.nextInt();
		    int m=sc.nextInt();
		    int a[] = new int[n];
		    int b[] = new int[m];
		    int flag=0;
		    
		    for(int j=0;j<n;j++) {
		        a[j]=sc.nextInt();
		    }
		    
		    for(int k=0;k<m;k++) {
		        b[k]=sc.nextInt();
		    }
		    
		    for(int l=0;l<n;l++) {
		        for(int p=0;p<m;p++) {
		            if(a[l]==b[p]) {
		                System.out.println("YES");
		                System.out.println(1 + " " + a[l]);
		                flag++;
		                break;
		            }
		            else {
		                continue;
		            }
		        }
		        
		    }
		    if (flag==0) {
		            System.out.println("NO");
		        }
		}
	}
}
