input: Write a python function to find the most common item in a list using the Counter class from the collections module.
  assert find_most_common_item([1, 7, 3, 8, 2, 9, 3, 5, 5, 8, 7, 3]) == 3
  assert find_most_common_item([4, 4, 4, 6, 6, 1, 2]) == 4
  assert find_most_common_item([10, 20, 10, 30, 40, 10, 20, 20]) == 10
output: def find_most_common_item(lst):
      from collections import Counter
      return Counter(lst).most_common(1)[0][0]