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())
while t>0:
	t -= 1
	n, m = input().split()
	n, m = int(n), int(m)
	a = [int(x) for x in input().split()]
	b = [int(x) for x in input().split()]

	ok = True
	val = -1
	for i in a:
		if i in b:
			ok = False
			val = i
			break

	if ok == True:
		print('NO')
	else:
		print('YES')
		print('1 {}'.format(val))