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
#import string
input = sys.stdin.readline
for f in range(int(input())):
	n,m=map(int,input().split())
	a=list(map(int,input().split()))
	b=list(map(int,input().split()))
	flag=False
	for i in a:
		if i in b:
			ans=i
			flag=True
			break
	if (flag==True):
		print("YES")
		print(1,ans)
	else:
		print("NO")			