<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def natural_sorted(iterable):
 """Return human sorted list of strings. E.g. for sorting file names. ['f1', 'f2', 'f10'] """

    def sortkey(x):
        return [(int(c) if c.isdigit() else c) for c in re.split(numbers, x)]

    numbers = re.compile(r'(\d+)')
    return sorted(iterable, key=sortkey)