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 i in range(int(input())):
	n, m = map(int, input().split())
	arr1 = list(map(int, input().split()))
	arr2 = list(map(int, input().split()))
	s = set()
	for i in arr1:
		if i not in s:
			s.add(i)
	ans = []
	flag = 0
	for i in arr2:
		if i in s:
			ans.append(i)
			flag = 1
			break
	if flag == 1:
		print('YES')
		print(len(ans), ' '.join(map(str, ans)))
	else:
		print('NO')