def test_case1(self):
cost = get_cost(['Oksana Baiul', 'Michelle Kwan'])
self.assertEqual(cost, 1)
def test_case2(self):
cost = get_cost([
'Elvis Stojko', 'Evgeni Plushenko', 'Kristi Yamaguchi'])
self.assertEqual(cost, 0)
def test_case3(self):
cost = get_cost(['1', '3', '4', '2'])
self.assertEqual(cost, 1)
