#同一时间格式
def sanitize(time_string):
    if "-" in time_string:
        splitter="-"
    elif ":" in time_string:
        splitter=":"
    else:
        return(time_string)
    (mins,secs)=time_string.split(splitter)
    return(mins+"."+secs)
#定义类，类继承  
class AthleteList(list):
    def __init__(self,a_name,a_dob=None,a_times=[]):
        list.__init__([])
        self.name=a_name
        self.dob=a_dob
        self.extend(a_times)
    def top3(self):
        return(sorted(set([sanitize(t)for t in self]))[0:3])
