from datetime import datetime


def timestamp(program: str):
    """
    Args:
        program (str): A string identifier specifying which run is asking for the timestamp.

    Returns: A timestamp of the current system time in a human-readable way, prepended by the given program string.
    """
    timestamp = str(datetime.now()).split(".")[0].replace(" ", "_").replace(":", "-")
    return f"{program}_{timestamp}"