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

#import sys
#sys.setrecursionlimit(10**9)
for tt in range(int(input())):
	n, m = map(int, input().split())
	a = list(map(int, input().split()))
	b = list(map(int, input().split()))
	present = {}
	for i in a:
		present[i] = 1
	flag = True
	ans = -1
	for i in b:
		try:
			ans = present[i]
			ans = i
			flag = False
			break
		except:
			continue
	if(flag):
		print("NO")
	else:
		print("YES")
		print(1, ans)
