input: Write a python function to find the most common element in a list.
  assert find_most_common_element([1, 2, 3, 4, 5, 2, 3, 3, 5, 2]) == 2
  assert find_most_common_element([1, 2, 3, 3, 4, 4, 4, 5, 5, 5, 5]) == 5
  assert find_most_common_element([1, 1, 1, 1, 1, 1, 1, 1, 1, 1]) == 1
output: def find_most_common_element(lst):
      from collections import Counter
      return Counter(lst).most_common(1)[0][0]