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.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class z {
    static int[] strToInts(String s) {
        String[] strings = s.split(" ");
        int[] ints = new int[strings.length];
        for (int i = 0; i < strings.length; i++) {
            ints[i] = Integer.parseInt(strings[i]);
        }
        return ints;
    }
    public static void main(String[] args) throws IOException {
        BufferedReader a= new BufferedReader(new InputStreamReader(System.in));
        int g= Integer.parseInt(a.readLine());
        for (int y = 0; y <g; y++) {
         a.readLine();
            String d = a.readLine();
            String h = a.readLine();
            int[] c = strToInts(d);
            int[] k = strToInts(d);
            boolean s = false;
            for (int i = 0; i < c.length; i++) {
                boolean has = false;
                for (int j = 0; j < k.length; j++) {
                    if (c[i] == k[j]) {
                        has = true;
                    }
                }
                if (has) {
                    System.out.println("yes");
                    s = true;
                    System.out.println("1 " + c[i]);
                    break;
                }
            }
            if (!s) {
                System.out.println("no");
            }
        }
            
        

    }
}

