Given an array of strings words, return all strings that can be typed using letters from only one row of an American keyboard.

You may return the strings in any order.

Note: Letter matching is case insensitive.

Constraints:

• $1 \leq$ words.length $\leq 20$

• $1 \leq$ words[i].length $\leq 100$

• words[i] consists of English letters, both lowercase and uppercase.

Now, let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:

We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Implement your solution in the following coding playground.