=====Example=====
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 

=====Problem Statement=====
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.

Difficulty: introductory

Starter code:

def split_and_join(line):
    # write your code here

if __name__ == '__main__':
    line = input()
    result = split_and_join(line)
    print(result)

Solutions:
# Enter your code here. Read input from STDIN. Print output to STDOUT
print(("-").join(input().strip().split()))