with open('polish_wiki_excerpt.in', encoding='utf8') as f:
    lines = f.readlines()
    results = []
    i = 0
    for line in lines:
        line = line.strip()

        subdigits = []
        pom = ''

        for char in line:
            if char in '0123456789':
                pom += char
            elif pom != '':
                subdigits.append(pom)
                pom = ''
            else:
                pass

        if pom.isdigit():
            subdigits.append(pom)

        if len(subdigits) > 0:
            finalLine = ' '.join(subdigits)
            print(finalLine)