import re

#Write a program to find all maximum substrings of digits.
#Return only these substrings separated by spaces in their order.
#Do use regular expressions.


def liczby_reg(file_path):
    with open(file_path, 'r', encoding='utf-8') as file:
        for line in file:
            number = (re.findall(r'\d+', line))
            if number:
                print(' '.join(number))


file_path = 'TaskD04\simple.in'
liczby_reg(file_path)