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 solve(n,m):
	target=0
	for i in n:
		if i in m:
			return i
	if target==0:
		return "NO"

t=int(input())
for i in range(t):
	n,m=input().split()
	n=list(map(int,input().split()))
	m=list(map(int,input().split()))
	z=solve(n,m)
	if z=="NO":
		print("NO")
	else:
		print("YES")
		print(f"1 {z}")








