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

from collections import deque,defaultdict
ans=""
for _ in range(int(input())):
	n,m=map(int,input().strip().split())
	a=list(map(int,input().strip().split()))
	b=list(map(int,input().strip().split()))
	d=defaultdict(int)
	for i in a:
		d[i]+=1
	flag=0
	for i in b:
		if d[i]!=0:
			flag=i
			break
	if flag==0:
		ans+="NO\n"
	else:
		ans+="YES\n"
		ans+=f"{1} {flag}\n"

print(ans)
	
