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.*;
public class Main
{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int t = sc.nextInt();
		while(t-->0){
		    int n = sc.nextInt();
		    ArrayList<Integer> ar1 = new ArrayList<Integer>();
		    int m = sc.nextInt();
		    ArrayList<Integer> ar2 = new ArrayList<Integer>();
		    for(int i = 0; i<n; i++) ar1.add(sc.nextInt());
		    for(int i = 0; i<m; i++) ar2.add(sc.nextInt());
		    Collections.sort(ar1);
		    Collections.sort(ar2);
		    ArrayList<Integer> res = new ArrayList<Integer>();
		    for(int i = 0; i<n; i++){
		        for(int j = 0; j<m; j++){
		            int x = ar1.get(i);
		            int y = ar2.get(j);
		            if(x==y) res.add(x);
		            else if(y>x) break;
		        }
		    }
		    int len = res.size();
		    if(len>0){
		        System.out.println("YES");
		        System.out.print(1+" "+res.get(0));
		        System.out.println();
		    }
		    else{
		        System.out.println("NO");
		    }
		}
	}
}
