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())
for i in range(t):
	n,m=map(int,input().split())
	l1=list(map(int,input().split()))
	l2=list(map(int,input().split()))
	l3=[]
	if n>=m:
		for i in l1:
			if i in l2:
				l3.append(i)
				break
	else:
		for i in l2:
			if i in l1:
				l3.append(i)
				break
	if len(l3)>0:
		print('YES')
		print(len(l3),end=' ')
		print(*l3)
	else:
		print('NO')