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

t=int(input())
for _ in range(t):
	n,m=input().split(" ")
	lst = list(map(int,input().split(" ")))
	lstt = list(map(int,input().split(" ")))
	a_set = set(lst)
	b_set = set(lstt)
	x = a_set.intersection(b_set)
	if len(x)>0:
		print("YES")
		print(1,list(x)[0])
	else:
		print("NO")