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 math
num_cases = int(input())
for _ in range(num_cases):
	n,m = list(map(int,input().strip().split()))
	arr1 = list(map(int,input().strip().split()))
	arr2 = list(map(int,input().strip().split()))
	lis = [0 for _ in range(1001)]
	for elem in arr1:
		lis[elem] = 1
	done = 0
	for elem in arr2:
		if (lis[elem] == 1):
			print("YES")
			print("%d %d"%(1,elem))
			done = 1
			break
	if (done == 0):
		print("NO")
	

