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 C658A {
public static void main(String[] args) {
	Scanner sc=new Scanner(System.in);
	int t=sc.nextInt();
	while(t-->0) {
		int n=sc.nextInt();
		int m=sc.nextInt();
		int[] a=new int[n];
		int[] b=new int[m];
		
		for(int i=0;i<n;i++)
			a[i]=sc.nextInt();
		
		for(int i=0;i<m;i++)
			b[i]=sc.nextInt();
		int flag=0;
		for(int i=0;i<n;i++) {
			for(int j=0;j<m;j++) {
				if(a[i]==b[j]) {
					flag=1;
					System.out.println("YES");
					System.out.println(1+" "+a[i]);
					break;
				}
			}
		}
		if(flag==0)
			System.out.println("NO");
	}
}
}
