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.Arrays;
import java.util.Scanner;


/* *********************************************************
 In the name of Allah , the most gracious , the most merciful. 
 
 **************************************************************/
public class NewClass9 {

                 public static void main(String[] args) {
                                  Scanner ob = new Scanner(System.in);
                                  int t=ob.nextInt();
                                  for(int T=1;T<=t;T++)
                                  {
                                    int m = ob.nextInt();
                                  int n = ob.nextInt();
                                  int a[] = new int[m];

                                  for (int i = 0; i < a.length; i++) {
                                                   a[i] = ob.nextInt();
                                  }

                                  int b[] = new int[n];
                                  for (int i = 0; i < b.length; i++) {
                                                   b[i] = ob.nextInt();
                                  }
                                  if (a.length < b.length) {
                                                   int k=0;
                                                   int x=0;
                                                   out:
                                                   for (int i = 0; i < a.length; i++) {
                                                                    for (int j = 0; j < b.length; j++) {
                                                                                     if (a[i] == b[j]) {
                                                                                                       x=b[i];
                                                                                                      k=1;
                                                                                                      break out;
                                                                                     }
                                                                    }
                                                   }
                                                       if(k==1)
                                                    {System.out.println("Yes");
                                                                     System.out.println(1 + " " +x);}
                                                    else{
                                                                     System.out.println("NO");
                                                    }
                                                   
                                  }
                                  else
                                  {
                                                   int k=0;
                                                   int x=0;
                                                    out:
                                                   for (int i = 0; i < b.length; i++) {
                                                                    for (int j = 0; j < a.length; j++) {
                                                                                     if (b[i] == a[j]) {
                                                                                                   x=b[i];
                                                                                                      k=1;
                                                                                                      break out;
                                                                                     }
                                                                    }
                                                   }
                                                    if(k==1)
                                                    {System.out.println("Yes");
                                                                     System.out.println(1 + " " +x);}
                                                    else{
                                                                     System.out.println("NO");
                                                    }
                                                   
                                  
                                  }
                                  }
                                
                 }
}