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.Arrays;
import java.util.Scanner;

public class Test {

	public static void main(String[] args) {

		Scanner in = new Scanner(System.in);
		int t = in.nextInt();
		while(t-- > 0) {
			int n = in.nextInt();
			int m = in.nextInt();
			int a[] = new int[n];
			int b[] = new int[m];
			for(int i = 0; i < n; i++) {
				a[i] = in.nextInt();
			}
			for(int i = 0; i < m; i++) {
				b[i] = in.nextInt();
			}
			Arrays.sort(a);
			Arrays.sort(b);
			int ans = -1;
			for(int i = 0; i < n; i++) {
				for(int j = 0; j < m; j++) {
					if(a[i] == b[j]) {
						ans = a[i];
					}
				}
			}
			System.out.println(ans == -1? "NO" : "YES\n" + ans);
		}
	}
}