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
input = sys.stdin.readline
I = lambda : list(map(int,input().split()))

t,=I()
for _ in range(t):
	n,m=I()
	a=I()
	b=I()
	an=-1
	x=[0]*1009
	for i in a:
		x[i]=1
	for i in b:
		if x[i]:
			an=i;break
	if an!=-1:
		print("YES")
		print(1,an)
	else:
		print("NO")