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

# @author - Kaleab Asfaw
import sys

input = sys.stdin.readline

#for _ in range(int(input())):
#lst = list(map(int, input().split()))
#def main():

# ****************************** START ********************************
def main(n, m, a, b):
	dictA = {}
	for i in a:
		dictA[i] = 1
	for i in b:
		if dictA.get(i):
			print("YES")
			return str(1) + " " + str(i)
	return "NO" 

for _ in range(int(input())):
	n, m = [int(x) for x in input().split()]
	a = list(map(int, input().split()))
	b = list(map(int, input().split()))
	print(main(n, m, a, b))
    

    
