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.*;
public final class Solution{
    public static void main(String args[]){
        Scanner scan=new Scanner(System.in);
        int t=scan.nextInt();
        while(t-- > 0){
            int m=scan.nextInt();
            int n=scan.nextInt();
            int a[]=new int[m];
            int b[]=new int[n];
            for(int i=0;i<m;i++){
                a[i]=scan.nextInt();
            }
            for(int i=0;i<n;i++){
                b[i]=scan.nextInt();
            }
            int x=0;
            for(int i=0;i<m;i++){
              for(int j=0;j<n;j++){
                  if(a[i]==b[j]){
                      x=1;
                      System.out.println("YES");
                      System.out.println("1 "+a[i]);
                      break;
                  }
                  if(x==1){
                      break;
                  }
              }  
            }
            if(x==0){
                System.out.println("NO");
            }
        }
        
    }
}