Double List Elements

Background

Congcong is learning list operations and wants to double each element in a given list of integers.

Problem Description

Given a list of integers, return a new list where each integer is multiplied by $2$.

Input Format

Input is given from standard input in the following format.

A list of space-separated integers. The list may be empty.

Output Format

Output is printed to standard output in the following format.

A new list where each element is $2$ times the corresponding element in the original list. Elements are comma-separated and enclosed in square brackets [].

Sample

[1 2 3]

[2, 4, 6]

[6 8 6 8 -1]

[12, 16, 12, 16, -2]

[]

[]

Sample Explanation

For the first sample input [1 2 3], each element in the list is multiplied by $2$, resulting in [2, 4, 6].

Constraints

Time limit: $1$ second, Memory limit: $1024$ KiB for each test case.