from boa.interop.System.ExecutionEngine import *


def Main(operation):

    if operation == "executing_sh":

        return GetExecutingScriptHash()

    elif operation == "script_container":
        return GetScriptContainer()

    elif operation == "calling_sh":
        return GetCallingScriptHash()

    elif operation == "entry_sh":
        return GetEntryScriptHash()

    return "unknown"