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PROBLEM STATEMENT

You are given a String consisting of lower-case letters.  Sort the characters
within that String in ascending alphabetical order, and return the resulting
String.  For example, if you are given the String "dbcba", you would re-arrange
the letters to form the String "abbcd".

DEFINITION

Class: StringSort
Parameters: String
Returns: String
Method signature (be sure your method is public): String sort(String str);

INPUT CONSTRAINTS

TopCoder will verify that all input constraints are met.
- str will contain between 0 and 50 characters, inclusive.
- str will contain only lower-case letters (a-z).

EXAMPLES:

str: "pickle"
Returns: "ceiklp"

str: "abhor"
Returns: "abhor"

str: "sortthisstring"
Returns: "ghiinorrsssttt"

str: "tesla"
Returns: "aelst"

str: ""
Returns: ""