# tested

from boa.interop.System.Runtime import *


def Main(operation, arg):

    if operation == "get_trigger":
        return GetTrigger()

    elif operation == "check_witness":
        return CheckWitness(arg)

    elif operation == "get_time":
        return GetTime()

    elif operation == "log":
        Log(arg)
        return True

    elif operation == "notify":
        Notify(arg)
        return True

    return "unknown"