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 sys
import math

# sys.stdin = open('input.txt', 'r')
# sys.stdout = open('output.txt', 'w')

input = sys.stdin.readline


T = int(input())
for t in range(T):
	n, m = map(int, input().split(' '))
	A = map(int, input().split(' '))
	B = map(int, input().split(' '))
	inter = set(A) & set(B)
	if inter:
		print('YES')
		print(1, next(iter(inter)))
	else:
		print('NO')