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 = list(map(int,input().split(" ")))
	b = list(map(int,input().split(" ")))
	s1 =set(a)
	s2 = set(b)
	x = s1.intersection(s2)
	if len(x) == 0:
		print("NO")
	else:
		print("YES")
		p = x.pop()
		print("1",p)
