Make a URL slug

Problem

A blog turns a title into a URL slug: all lower case, words joined by single hyphens.

Read a title and print its slug. Extra spaces must not create extra hyphens.

Input: One line of text.
Output: The slug.
Constraints: 1 ≤ length ≤ 100
The title has letters, digits and spaces only.

Example

Input

Learn Python Fast

Output

learn-python-fast

Try the problem first. Open one hint at a time.

Hint 1

Lower-case the title, then split it into words.

Hint 2

Join the words with "-".

Write your Python code, run it on the examples and submit it to hidden tests.