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A.java
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import java.util.*;
import java.lang.*;
public class cs{
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 arr[]=new int[n];
int brr[]=new int[m];
for(int i=0;i<n;i++)
arr[i]=sc.nextInt();
for(int i=0;i<m;i++)
brr[i]=sc.nextInt();
int flag=0,ans=0;
for(int i=0;i<n;i++){
for(int j=0;j<m;j++)
{
if(arr[i]==brr[j]){
flag=1;
ans=arr[i];
break;
}
}
if(flag==1)
break;
}
if(flag==1){
System.out.println("Yes");
System.out.println("1"+" "+ans);
}
else
System.out.println("No");
}
}
}