Extract First and Last Elements

Background

Congcong is learning about array operations. He wants to write a program that can quickly extract the first and last elements from a given array.

Problem Description

Given an array of integers, return a new array of length $2$ containing the first and last elements from the original array. The original array will have a length of $1$ or more.

Input Format

Input is given from Standard Input in the following format.

A single line containing an array of integers. Elements are space-separated and enclosed in square brackets [].

Output Format

Output is printed to Standard Output in the following format.

A single line containing a new array of length $2$, which includes the first and last elements of the original array. Elements are comma-space separated and enclosed in square brackets [].

Sample

[1 2 3]

[1, 3]

[1 2 3 4]

[1, 4]

[7 4 6 2]

[7, 2]

Sample Explanation

For the sample input [1 2 3], the first element of the array is $1$ and the last element is $3$. Therefore, the new array returned is [1, 3].

Constraints

Time limit: $1$ second per test case. Memory limit: $1024$ KiB per test case.