input: Write a python function to count the frequency of elements in a list using the Counter class from the collections module.
  assert count_frequency([1, 1, 2, 3, 3, 3, 4, 4, 5]) == Counter({3: 3, 1: 2, 4: 2, 2: 1, 5: 1})
  assert count_frequency([5, 5, 5, 6, 6, 7]) == Counter({5: 3, 6: 2, 7: 1})
  assert count_frequency([1, 2, 3, 4, 5]) == Counter({1: 1, 2: 1, 3: 1, 4: 1, 5: 1})
output: from collections import Counter
  
  def count_frequency(lst):
      return Counter(lst)