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

from sys import stdin
input = stdin.buffer.readline

for _ in range(int(input())):
	cnt = [0] * 1001
	input()
	for i in map(int, input().split()):
		cnt[i] = 1
	*b, = map(int, input().split())
	for i in b:
		if cnt[i]:
			print('YES')
			print(1, i)
			break
	else:
		print('NO')
