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