input: Write a function to find the largest and smallest numbers in a list.
  assert find_limits([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == (10, 1)
  assert find_limits([10, 20, 45, 67, 84, 93]) == (93, 10)
  assert find_limits([5, 7, 9, 8, 6, 4, 3]) == (9, 3)
output: def find_limits(lst):
      return (max(lst), min(lst))