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(input()):
	n, m = map(int,raw_input().split())
	a = map(int,raw_input().split())
	b = map(int,raw_input().split())
	f = 0
	for i in range(n):
		for j in range(m):
			if a[i] == b[j]:
				print "YES"
				print 1, a[i]
				f = 1
				break
		if f:
			break
	if not f:
		print "NO"