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.Scanner;
public class Main 
{
    public static void main(String[] args) 
    {
        Scanner sc = new Scanner(System.in);
        int opt = sc.nextInt();
        while(opt-->0)
        {
            int n = sc.nextInt();
            int m = sc.nextInt();
            int asp[] = new int[n];
            int bsp[] = new int[m];
            for(int i=0;i<n;i++)
            {
                asp[i] = sc.nextInt();
            }
            for(int i=0;i<m;i++)
            {
                bsp[i] = sc.nextInt();
            }
            boolean g = false;
            for(int i=0;i<n;i++)
            {
                for(int j=0;j<m;j++)
                {
                    if(asp[i]==bsp[j])
                    {
                        System.out.println("YES");
                        System.out.println(1+" "+asp[i]);
                        g= true;
                    }
                }
                if(g) break;
            }
            if(!g)
            {
                System.out.println("NO");
            }
        }
    }
}
