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.*;
import java.io.*;
public class Main{
    static BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
    static StringTokenizer st;
    static PrintWriter pr = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
    public static void main(String[] args) throws IOException{
        int t = readInt();
        for(int z = 0; z<t; z++){
            int n = readInt(), m = readInt(), arr[] = new int[1001], arr1[] = new int[1001];
            for(int i = 0; i<n; i++){
                arr[readInt()]++;
            }
            for(int i = 0; i<m; i++){
                arr1[readInt()]++; 
            }
            int ans = -1;
            for(int i = 0; i<arr.length; i++){
                if(arr[i]==arr1[i]&&arr[i]!=0){
                    ans = i;
                    break;
                }
            }
            if(ans==-1)System.out.println("NO");
            else{
                System.out.println("YES");
                System.out.println(1+" "+ans);
            }
        }
    }
    static String next () throws IOException {
        while (st == null || !st.hasMoreTokens())
                st = new StringTokenizer(input.readLine().trim());
        return st.nextToken();
    }
    static long readLong () throws IOException {
        return Long.parseLong(next());
    }
    static int readInt () throws IOException {
        return Integer.parseInt(next());
    }
    static double readDouble () throws IOException {
        return Double.parseDouble(next());
    }
    static char readChar () throws IOException {
        return next().charAt(0);
    }
    static String readLine () throws IOException {
        return input.readLine().trim();
    }
}
