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

#!/usr/bin/env pypy3

from sys import stdin, stdout
 
def input():
    return stdin.readline().strip()

def ans(A, B):
	intersect = set(A) & set(B)

	if len(intersect) == 0:
		print("NO")
		return

	i = list(intersect)[0]

	print("YES")
	print(1, i)

T = int(input())

for _ in range(T):
	input()
	A = input().split(' ')
	A = list(map(int, A))
	B = input().split(' ')
	B = list(map(int, B))
	ans(A, B)