7 kyu
[link to kata](https://www.codewars.com/kata/58b8c94b7df3f116eb00005b/train/javascript)
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[my solution]('./kata.js')
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<h1 id="task">Task</h1>
Given a string str, reverse it and omit all non-alphabetic characters.
For str = "krishan", the output should be "nahsirk".
For str = "ultr53o?n", the output should be "nortlu".
[input]stringstr
A string consists of lowercase latin letters, digits and symbols.
[output]a string