Given a set of words, how many letters do you have to remove from them to make them anagrams?

Example

You are given the set of words {'hello', 'hola', 'allo'}. To obtain anagrams, you have to remove 3 letters from 'hello' (the letters 'hel'), 2 letters from 'hola' (the letters 'ha'), and 2 letters from 'allo' ('al'), therefore the result is 7 (the anagram is 'lo', or 'ol' since order doesn't matter).

Hints

• A word is an anagram of another word if they have the same letters (usually in a different order).
• Do not worry about case. All inputs will be lowercase.

You may want to check out this kata's little brother (or sister) : https://www.codewars.com/kata/anagram-difference