Yes, it is.

some of the random tests have the same letter twice and yet it is supposed to be true?

Python, likely others: missing testcase for 'abcdefghijklmnopqrstuvwxyz', which is to say exactly the required characters but no additional characters. Solutions such as this one have an off-by-one bug in this case

Solved in the last attempt C++

Solved in the first attempt
C++

Approved

thanks, my bad.

Not a kata suggestion. See https://docs.codewars.com/training/troubleshooting#post-discourse.

JavaScript Completions 61522

Sorry, but, no, the problem is in your code.

it uses the letters A-Z at least once (case is irrelevant)

Do you know what the last part means? Also, the logic in your code is wrong. Print both parts of what you're trying to compare.

there is a problem in your test

easy

it seems he is working for Google and have no time to answer