import sys
from argparse import ArgumentParser, FileType

if __name__ == "__main__":
    parser = ArgumentParser()
    parser.add_argument(
        "-i",
        "--input-file",
        type=FileType("r"),
        default=(None if sys.stdin.isatty() else sys.stdin),
    )

    ns = parser.parse_args()
    if ns.input_file:
        with (
            open(ns.input_file, "r") if ns.input_file != sys.stdin else ns.input_file
        ) as f:
            for line in f.readlines():
                print(line)