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

t=int(input())
while(t):
	t=t-1
	flag=0
	m,n = [int(i) for i in input().split()]
	a = [int(i) for i in input().split()]
	b = [int(i) for i in input().split()]
	for i in range(0,m):
		for j in range(0,n):
			if(a[i]==b[j]):
				flag=1
				value=a[i]
				break
		if(flag==1):
			break
	if(flag==0):
		print("NO")
	else:
		print("YES")
		print(1,value)
