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.Scanner;
public class common_sub {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner obj=new Scanner(System.in);
		int query=obj.nextInt();
		for(int i=0;i<query;i++) {
			int n1=obj.nextInt();
			int n2=obj.nextInt();
			String s1="";
			for(int f=0;f<n1;f++) {
				s1+=obj.nextInt()+" ";
			}
			int res=-1;
			boolean go=true;
			for(int f=0;f<n2;f++) {
				int cur=obj.nextInt();
				if(go&&s1.indexOf(cur+" ")!=-1) {
					res=cur;
					go=false;
				}
			}
			if(res!=-1) {
				System.out.println("YES");
				System.out.println(1+" "+res);
			}
			else System.out.println("NO");
		}
	}

}