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

if __name__ == '__main__':
	t = int(input())
	for _ in range(t):
		n, m = map(int, input().split())
		arr1 = list(map(int, input().rstrip().split()))
		arr2 = list(map(int, input().rstrip().split()))

		arr1.sort()
		arr2.sort()

		val = -1

		for i in range(n):
			a = arr1[i]
			for j in range(m):
				b = arr2[j]
				if a == b:
					val = a
					break
				if b > a:
					break
			if val != -1:
				break

		if val == -1:
			print('NO')
		else:
			print('YES')
			print('1 ' + str(val))
