while True:
    try:
        mapping={'reset':'reset what','reset board':'board fault','board add':'where to add',
               'board delete':'no board at all','reboot backplane':'impossible','backplane abort':'install first'}
        operation=list(mapping.keys())
        response=list(mapping.values())
        board_in=input().strip().split()
        if len(board_in)==1:
            for element in operation:
                element=element.split()
                if len(element)==1:
                    if board_in[0]==element[0][0:len(board_in[0])]:
                        res=mapping[element[0]]
                    else:
                        res='unknown command'
        elif len(board_in)==2:
            lst=[]
            for element_ in operation:
                element=element_.split()
                if len(element)==2:
                    if board_in[0]==element[0][0:len(board_in[0])] and board_in[1]==element[1][0:len(board_in[1])]:
                        lst.append(element_)
            if len(lst)==1:
                res=mapping[lst[0]]
            else:
                res='unknown command'
        elif len(board_in)==0:
            break
        else:
             res='unknown command'
        print(res)
    except:
        break