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

for _ in range(int(input())):
	m,n = map(int,input().strip().split(" "))
	d = {}
	l = list(map(int,input().strip().split(" ")))
	ll = list(map(int,input().strip().split(" ")))
	for i in l:
		if i not in d:
			d[i]=1
	flag = -1
	val = 0
	for i in ll:
		if i in d:
			flag = 1
			val = i
			break
	if flag==-1:
		print("NO")
	else:
		print("YES")
		print(1,i)
