Keep only even numbers from a list

Summary

Return a new list containing only the even integers from the input, preserving order.

Problem statement

Given a list of integers, implement a function keep_even(nums) that returns a new list containing only the even numbers from nums in the same order they appeared. Zero and negative even numbers count as even. If there are no even numbers, return an empty list.

Task

Write a function that filters a list to keep only even numbers while preserving the original order.

Examples

Input format

A single list of integers.

Output format

A list of integers containing only the even numbers from the input list, preserving order.

Constraints

The input list length can be from 0 up to a few thousand elements. Elements are integers.

Samples