Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

D. Points and Powers of Two

time limit per test

4 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputThere are $$$n$$$ distinct points on a coordinate line, the coordinate of $$$i$$$-th point equals to $$$x_i$$$. Choose a subset of the given set of points such that the distance between each pair of points in a subset is an integral power of two. It is necessary to consider each pair of points, not only adjacent. Note that any subset containing one element satisfies the condition above. Among all these subsets, choose a subset with maximum possible size.

In other words, you have to choose the maximum possible number of points $$$x_{i_1}, x_{i_2}, \dots, x_{i_m}$$$ such that for each pair $$$x_{i_j}$$$, $$$x_{i_k}$$$ it is true that $$$|x_{i_j} - x_{i_k}| = 2^d$$$ where $$$d$$$ is some non-negative integer number (not necessarily the same for each pair of points).

Input

The first line contains one integer $$$n$$$ ($$$1 \le n \le 2 \cdot 10^5$$$) — the number of points.

The second line contains $$$n$$$ pairwise distinct integers $$$x_1, x_2, \dots, x_n$$$ ($$$-10^9 \le x_i \le 10^9$$$) — the coordinates of points.

Output

In the first line print $$$m$$$ — the maximum possible number of points in a subset that satisfies the conditions described above.

In the second line print $$$m$$$ integers — the coordinates of points in the subset you have chosen.

If there are multiple answers, print any of them.

Examples

Input

6

3 5 4 7 10 12

Output

3

7 3 5

Input

5

-1 2 5 8 11

Output

1

8

Note

In the first example the answer is $$$[7, 3, 5]$$$. Note, that $$$|7-3|=4=2^2$$$, $$$|7-5|=2=2^1$$$ and $$$|3-5|=2=2^1$$$. You can't find a subset having more points satisfying the required property.

Codeforces (c) Copyright 2010-2020 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Jan/20/2020 02:28:24 (h3).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|