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.*;
import java.util.*;
import java.lang.*;
public class Main{
    public static void main(String[] args){
        Scanner scn = new Scanner(System.in);
        int tc = scn.nextInt();
        while(tc > 0)
        {
            int n = scn.nextInt();
            int m = scn.nextInt();
            int[] f1 = new int[1001];
            int[] f2 = new int[1001];
            int[] a = new int[n];
            for(int i=0;i<n;i++)
            {
                a[i] = scn.nextInt();
                f1[a[i]]++;
            }
            int[] b = new int[m];
            for(int i=0;i<m;i++)
            {
                b[i] = scn.nextInt();
                f2[b[i]]++;
            }
            boolean ans = false;
            int num = 0;
            for(int i=1;i<=1000;i++)
            {
                if(f1[i] == f2[i])
                {
                    num = i;
                    ans = true;
                    break;
                }
            }
            
            if(ans)
            {
                System.out.println("YES");
                System.out.println(1 + " "+ num);
            }
            else
            {
                System.out.println("NO");
            }
            tc--;
        }
    }
}