def split_and_join(line): s_line=line.split(" ") j_line="-".join(s_line)

return j_line 

we can use this two methods adn make the code short and easy

words = line.split()
return '-'.join(words)

    or

return line.replace(" ", "-")

def split_and_join(line): # write your code here a=line.split() a='-'.join(a) return a if name == 'main': line = input() result = split_and_join(line) print(result)

For Python3

def split_and_join(line):
    return "-".join(line.split())

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

as i came with another way, i let you know...

def split_and_join(line): l=line.split() return '-'.join(l)

if name == 'main': line = input() result = split_and_join(line) print(result)