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

# your code goes here
for i in range(int(input())):
	n,k=list(map(int,input().split()))
	lst=list(map(int,input().split()))
	lst1=list(map(int,input().split()))
	f=0
	lst1.sort()
	lst.sort()
	lst1=set(lst1)
	lst=set(lst)
	for i in lst:
		if i in lst1:
			print("YES")
			print("1 "+str(i))
			f=1
			break
	if(f==0):
		print("NO")