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.HashMap;

import java.util.Scanner;

public class Practice4 {
	static public int common(int array1[],int array2 []) {
		HashMap<Integer,String> map=new HashMap<Integer,String>();
		for(int i=0;i<array1.length;i++) {
			map.put(array1[i], "G");
		}
		for(int i=0;i<array2.length;i++) {
			if(!map.containsKey(array2[i])) map.put(array2[i], "G");
			else if(map.containsKey(array2[i])) {
				return array2[i];
			}
		}
		return 9999;
	}
	
	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[] arr1=new int[n];
        for(int i=0;i<n;i++) {
        	arr1[i]=sc.nextInt();
        }
        int[] arr2=new int[m];
        for(int i=0;i<m;i++) {
        	arr2[i]=sc.nextInt();
        }
       int x=common(arr1,arr2);
       if(x==9999) System.out.println("NO");
       else {System.out.println("YES");
       System.out.println("1 "+x);}
	}

	}

}
