String Split and Join-Python

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 

Python 3.0 Code:

inputsplit=input().split()
output="-".join(inputsplit)
print(output)