input: Write a python function to find the most common string and integer in a list.
  assert most_common_string(['apple', 'banana', 'apple', 'cherry', 'banana', 'apple']) == 'apple'
  assert most_common_string(['dog', 'cat', 'bird', 'dog', 'cat', 'dog']) == 'dog'
  assert most_common_integer([1, 2, 2, 3, 3, 3, 4, 4, 4, 4]) == 4
  assert most_common_integer([5, 5, 6, 7, 7, 7, 8, 8, 8, 8, 8]) == 8
output: from collections import Counter
  
  def most_common_string(lst):
      return Counter(lst).most_common(1)[0][0]
  
  def most_common_integer(lst):
      return Counter(lst).most_common(1)[0][0]