import sys
import re

def solve(lines):
    # filter all substrings that match
    # print
    # print(None, re.findall(r"\b\d+\b", lines[3]))
    # return []
    p = re.compile(r"\b\d+\b")
    res = []
    for l in lines:
        m = re.findall(p, l)
        if m:
            res.append(' '.join(m) + '\n')
    return res

if __name__ == "__main__":
    lines = []
    
    fp = sys.argv[1]
    assert("polish_wiki_excerpt" in fp)

    print(fp)
    with open(fp, encoding="utf-8") as f:
        lines = f.readlines()
    sol = solve(lines)
    with open("./polish_wiki_excerpt.out", 'w', encoding="utf-8") as f:
        f.writelines(sol)