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 nt in range(int(input())):
	n,m = map(int,input().split())
	a = set(list(map(int,input().split())))
	b = set(list(map(int,input().split())))
	flag = 0
	for i in a:
		if i in b:
			flag = i
			break
	if flag:
		print ("YES")
		print (1,i)
		continue
	print ("NO")
