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;
import java.util.ArrayList;
import java.util.StringTokenizer;

public class CommonSubsequence {
    
    public static void main(String[] args) throws IOException {
        
        BufferedReader f = new BufferedReader(
        new InputStreamReader(System.in));
        
        int cases = Integer.parseInt(f.readLine());
        
        StringTokenizer st;
        
        int lengthA, lengthB;
        int c = 0;
        
        boolean bb;
        
        int i, j, k;
        
        ArrayList<Integer> a = new ArrayList<Integer>();
        ArrayList<Integer> b = new ArrayList<Integer>();
        
        for(i = 0; i < cases; i++)
        {
            a.clear();
            b.clear();
            
            bb = false;
            
            st = new StringTokenizer(f.readLine());
            
            lengthA = Integer.parseInt(st.nextToken());
            lengthB = Integer.parseInt(st.nextToken());
            
            st = new StringTokenizer(f.readLine());
            for(j = 0; j < lengthA; j++)
                a.add(Integer.parseInt(st.nextToken()));
            
            st = new StringTokenizer(f.readLine());
            for(j = 0; j < lengthB; j++)
                b.add(Integer.parseInt(st.nextToken()));
            
            for(j = 0; j < lengthA; j++)
            {
                for(k = 0; k < lengthB; k++)
                {
                    if(a.get(j) == b.get(k))
                    {
                        bb = true;
                        c = a.get(j);
                    }
                }
            }
            
            if(bb)
            {
                System.out.println("YES");
                System.out.println("1 " + c);
            }
            else
                System.out.println("NO");
        }
    }
}