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.io.*;
public class Main{
	
	public static void main(String[] args) {
		Scanner scn=new Scanner(System.in);
		int t=scn.nextInt();
		while(t-->0) {
			int n=scn.nextInt();
			int m=scn.nextInt();
		int []arr1=new int[n];
		for(int i=0;i<n;i++) {
			arr1[i]=scn.nextInt();
		}
		int []arr2=new int[m];
		for(int j=0;j<m;j++) {
			arr2[j]=scn.nextInt();
		}
		int []freq=new int[1001];
		for(int i=0;i<n;i++) {
			if(freq[arr1[i]]==0) {
			freq[arr1[i]]++;
			}
		}
		for(int i=0;i<m;i++) {
			freq[arr2[i]]++;
		}
		int ans=0;
		int flag=0;
		for(int i=0;i<freq.length;i++) {
			if(freq[i]>1) {
				ans=i;
				flag=1;
				break;
			}
		}
		if(flag==0) {
			System.out.println("NO");
		}else {
			System.out.println("YES");
			System.out.println("1"+" "+ans);
		}
		}
		
	}
}