Most Wanted Letter

Most Wanted Letter


You are given a text, which contains different English letters and punctuation marks. You should find the most frequent letter in the text. The letter returned must be in lowercase.
During the search for the most wanted letter, casing doesn’t matter, "A" == "a". Make sure you don’t count in the punctuation marks, digits and whitespaces, just letters.

If you have two or more letters occurring the same number of times , then return all of them as a list. For example -- "Hello, Evan" should return ['e', 'l'].

Input: A text for analysis as a string.

Output: The list of the most frequent letters in lowercase.


most_wanted("Hello World!") == ["l"]
most_wanted("How do you do?") == ["o"]
most_wanted("One") == ["o", "n", "e"]
most_wanted("Oops!") == ["o"]
most_wanted("AAaooo!!!!") == ["a", "o"]
most_wanted("abe") == ["a", "b", "e"]

How it is used: For most decryption tasks you need to know the occurrence frequency of various letters in a section of text. For example: we can easily crack a simple addition or substitution cipher if we know the frequency in which letters appear. It’s pretty interesting stuff for language experts!

Precondition :
A text contains only ASCII symbols.
0 < len(text) ≤ 10 5

Invalid hot key. Each hot key should be unique and valid
Hot keys:
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.

Pair Programming (Beta-version)

Welcome to Pair Programming! Engage in real-time collaboration on coding projects by starting a session and sharing the provided unique URL with friends or colleagues. This feature is perfect for joint project development, debugging, or learning new skills together. Simply click 'Start Session' to begin your collaborative coding journey!

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