Problem:

In Python, a string can be split on a delimiter.

Example:

>>> a = "this is a string"

>>> a = a.split(" ") # a is converted to a list of strings.

>>> print a

['this', 'is', 'a', 'string']

Joining a string is simple:

>>> a = "-".join(a)

>>> print a

this-is-a-string

Task:

You are given a string. Split the string on a " " (space) delimiter and join using a - hyphen.

Input Format:

The first line contains a string consisting of space separated words.

Output Format:

Print the formatted string as explained above.

Sample Input:

this is a string

Sample Output:

this-is-a-string

Solution: