input: Write a python function to find the most frequent item in a list.
  assert most_frequent_item([1, 2, 3, 4, 4, 1, 2, 3, 3]) == 3
  assert most_frequent_item([5, 5, 5, 2, 2, 3]) == 5
  assert most_frequent_item(['a', 'b', 'c', 'a', 'b', 'a']) == 'a'
output: def most_frequent_item(lst):
      from collections import Counter
      count = Counter(lst)
      return count.most_common(1)[0][0]