Improve the given code below, make sure that the code will require input from the user.  Problem: Write a JavaScript function that would accept a string and returns its letters in alphabetical order.   function alpha(str){ let res; var arr = str.split(""); //splits the str res = arr.sort().join(""); //sorts arr && forms to a str return res; } console.log("Num5"); console.log(alpha("CSIT201"));

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