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