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())):
	n, m = map(int, input().split())
	a = list(map(int,input().strip().split()))[:n]
	b = list(map(int,input().strip().split()))[:m]
	ans = 0
	found = False
	for e in b:
		if e in a:
			ans = e
			found = True
			break
	if not found:
		for e in a:
			if e in b:
				ans = e
				found = True
				break

	if not found:
		print('NO')
	else:
		print('YES')
		print('1 ', ans)