Challenge: String With a Zero Space

Problem statement

You are given a string s containing whitespace characters at the beginning and/or end.

Write a function trimstr that takes in the string as input and returns a new string with the leading and trailing whitespace removed. The list of white spaces are \t \r \n \v \f .

Input

The input is a single string s consisting of printable ASCII characters.

Output

The function trimstr should return a new string with the leading and trailing whitespace removed. The function should return an empty string if the input string contains only whitespace characters.

Exercise