Common Words Common Words
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Let's continue examining words. You are given two strings with words separated by commas. Try to find what is common between these strings. The words in the same string don't repeat.

Your function should find all of the words that appear in both strings. The result must be represented as a string of words separated by commas in alphabetic order.

Input: Two arguments as strings.

Output: The common words as a string.

Example:

checkio('hello,world', 'hello,earth') == 'hello'
checkio('one,two,three', 'four,five,six') == ''
checkio('one,two,three',
 'four,five,one,two,six,three') == 'one,three,two'

How it is used: Here you can learn how to work with strings and sets. This knowledge can be useful for linguistic analysis.

Precondition:
Each string contains no more than 10 words.
All words separated by commas.
All words consist of lowercase latin letters.

Settings
Code:
CheckiO Extensions

CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.

In order to install CheckiO client you'll need installed Python (version at least 3.8)

Install CheckiO Client first:

pip3 install checkio_client

Configure your tool

checkio --domain=py config --key=

Sync solutions into your local folder

checkio sync

(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)

checkio serv -d

Alternatevly, you can install Chrome extension or FF addon

checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium

Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.

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