Common Subsequence

Description:

Input:

The first line contains a single integer $$$t$$$ ($$$1\le t\le 1000$$$)  — the number of test cases. Next $$$3t$$$ lines contain descriptions of test cases.

The first line of each test case contains two integers $$$n$$$ and $$$m$$$ ($$$1\le n,m\le 1000$$$)  — the lengths of the two arrays.

The second line of each test case contains $$$n$$$ integers $$$a_1,\ldots,a_n$$$ ($$$1\le a_i\le 1000$$$)  — the elements of the first array.

The third line of each test case contains $$$m$$$ integers $$$b_1,\ldots,b_m$$$ ($$$1\le b_i\le 1000$$$)  — the elements of the second array.

It is guaranteed that the sum of $$$n$$$ and the sum of $$$m$$$ across all test cases does not exceed $$$1000$$$ ($$$\sum\limits_{i=1}^t n_i, \sum\limits_{i=1}^t m_i\le 1000$$$).

Output:

For each test case, output "YES" if a solution exists, or "NO" otherwise.

If the answer is "YES", on the next line output an integer $$$k$$$ ($$$1\le k\le 1000$$$)  — the length of the array, followed by $$$k$$$ integers $$$c_1,\ldots,c_k$$$ ($$$1\le c_i\le 1000$$$)  — the elements of the array.

If there are multiple solutions with the smallest possible $$$k$$$, output any.

Sample Input:

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

Sample Output:

YES
1 4
YES
1 3
NO
YES
1 3
YES
1 2

Note:

In the first test case, $$$[4]$$$ is a subsequence of $$$[10, 8, 6, 4]$$$ and $$$[1, 2, 3, 4, 5]$$$. This array has length $$$1$$$, it is the smallest possible length of a subsequence of both $$$a$$$ and $$$b$$$.

In the third test case, no non-empty subsequences of both $$$[3]$$$ and $$$[2]$$$ exist, so the answer is "NO".