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.StringTokenizer;

public class ComSub {

	public static void main(String[] args) throws IOException{
		// TODO Auto-generated method stub
		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
		int n = Integer.parseInt(bf.readLine());
		for(int i=1;i<=n;i++) {
			StringTokenizer st = new StringTokenizer(bf.readLine());
			int an = Integer.parseInt(st.nextToken());
			int bn = Integer.parseInt(st.nextToken());
			
			String[]a = bf.readLine().split(" ");
			String b = bf.readLine();
			
			boolean found = false;
			
			for(int j=0;j<a.length;j++) {
				String c = (a[j]);
				
				if(b.indexOf(c)>=0) {
					
					found=true;
					System.out.println("YES\n"+1+" "+c);
					break;
				}
			}
			if(!found) {
				System.out.println("NO");
			}
		}
	}

}
