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 defaultdict, Counter
from math import log, ceil, floor

def solve():
	#n = int(input())
	#s = input()
	#n = len(s)
	n, m = list(map(int, input().split()))
	a =  list(map(int, input().split()))
	b =  list(map(int, input().split()))
	c = set(a)
	for i in b:
		if i in a:
			print("YES")
			print(1, i)
			return 
	print("NO")


##################################################################
if __name__ == "__main__":
	t = 1
	t = int(input())
	for _ in range(t): solve()