import re
import itertools
import sys


def snake_case_split(ident):
    """
    Split a snake case identifier into words, returning the original ident and its splits as a list
    """
    splits = filter(None, re.split('_', ident))
    if len(splits) <= 1:
         return [ident]
    splits.append(ident)
    return splits

def camel_case_split(ident):
    """
    Split a camel-case identifier into words, returning the original ident and its splits 
    """
    matches = re.finditer('.+?(?:(?<=[a-z])(?=[A-Z])|(?<=[A-Z])(?=[A-Z][a-z])|$)', ident)

    splits = [m.group(0) for m in matches]
    if len(splits) <= 1:
        return [ident]
    splits.append(ident)
    return splits

def tokenize_code(fileName):
    """
    Open a file name and return it's expanded tokenized version by removing non alphanumeric stuff, 
    and splitting camel/snake case
    """
    with open(fileName) as f:
        lines = []
        for line in f:
            toks = filter(None, re.split('\W', line ))
            if not toks:
                continue
            toks = itertools.chain(*(camel_case_split(x) for x in toks))
            toks = itertools.chain(*(snake_case_split(x) for x in toks))
            
            lines.append(toks)
    return lines


if __name__ == '__main__':

    print('\n'.join((' '.join(line) for line in tokenize_code(sys.argv[1]))))