def sn2recipe(scenario: list) -> list:
    """
    Extract scenario item to recipe

    Parameters
    ----------
        scenario: list
            use only index 1
            0: number, 1: items (order and recipe), 2:judge
    Returns
    ----------
        subOrder: list
            0: mainOrder, 1-end:subOrders
    """
    # slice main task
    allOrder = str(scenario[1].split('<')[1])
    mainOrder = allOrder.split('_')[0]
    subOrders = str(allOrder.split('_',1)[1]).replace('>','').split('_')
    subOrders.insert(0, mainOrder)
    # return result
    return subOrders