ค้นหานามสกุลของสมาชิกของสโมสร "Bootup Baltimore"
Find the last names of the members of the club "Bootup Baltimore".
club = pd.DataFrame(columns=['clubid', 'clubname']); student = pd.DataFrame(columns=['lname', 'stuid']); member_of_club = pd.DataFrame(columns=['clubid', 'stuid'])
student[student['stuid'].isin(member_of_club[member_of_club['clubid'].isin(club[club['clubname'] == 'Bootup Baltimore']['clubid'])]['stuid'])]['lname']