S-4 Return abbreviation

Create variable that should hold this string: "World will not believe it, when i will become a developer!". 

Create a function that accepts this string as an argument and returns it's abbreviated form, that means a collection of all the first letters of each word together. All letters should be in upper case at the end. 

So your final form should look like: 'WWNBIWIWBAD'. Find a way to ignore the commas and exclamation marks by replacing them with nothing before you start.

Use all the strings' and arrays' methods you have learned.