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 function(arrayA,setB):
	for i in arrayA:
		if i in setB:
			return i
	return -1
for i in range(int(input())):
	A,B=[int(x) for x in input().split()]
	arrayA=[int(x) for x in input().split()]
	setB=set([int(x) for x in input().split()])
	if function(arrayA,setB)!=-1:
		print("YES")
		print("1 " + str(function(arrayA,setB)))
	else:
		print("NO")