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

def findcommon(arr_a, arr_b):
	for i in range(a):
		if arr_a[i] in arr_b:
			print("YES")
			print(str(1), arr_a[i])
			return
	else:
		print("NO")




t = int(input())
for i in range(t):
	ab = input().strip().split()
	a = int(ab[0])
	b = int(ab[1])
	arr_a = list(map(int, input().strip().split()))
	arr_b = list(map(int, input().strip().split()))
	findcommon(arr_a, arr_b)	

