import sys
import re

def solve(lines):
    print(len(lines))
    return [l for l in lines if re.search(r"19\d\d r\.", l)]

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)