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

for _ in range(int(input())):
	n,m=map(int,input().split())
	a=sorted(list(map(int,input().split())))
	b=sorted(list(map(int,input().split())))
	i=0
	j=0
	while i<n and j<m:
		if a[i]<b[j]:
			i+=1
		elif a[i]>b[j]:
			j+=1
		else:
			print("YES")
			print(1,a[i])
			break
	else:
		print("NO")