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

# Anuneet Anand

T = int(input())

while T:
	n,m = map(int,input().split())
	A = list(map(int,input().split()))
	B = list(map(int,input().split()))
	A = set(A)
	B = set(B)

	c = -1
	for i in A:
		if i in B:
			c=i

	if c!=-1:
		print("YES")
		print(1,c)
	else:
		print("NO")
	T = T - 1