>>> from race import podium

>>> lc = ['Johnson', 'Bolt','Carter','Gatlin','Powell']
>>> podium(lc)
['Powell', 'Gatlin', 'Carter']
>>> lc1 = ['Johnson', 'Jacobs','Carter', 'Silva', 'Gatlin','Bolt']
>>> podium(lc1)
['Bolt', 'Gatlin', 'Silva']