import re import sys found_lines = [] for line in sys.stdin: if re.search(r'\b19\d{2}\s*r\.\b|\b\W19\d{2}\s*r\.\b|\b19\d{2}\s*r\.\W', line, flags=re.IGNORECASE): found_lines.append(line.strip()) if found_lines: print('\n'.join(found_lines))