input: Write a function to find the last index of a given element in a list.
  assert find_last_index([2, 5, 9, 2, 4], 2) == 3
  assert find_last_index([1, 2, 3, 4, 5, 2, 6, 7, 2], 2) == 8
  assert find_last_index([10, 20, 30, 40, 50], 30) == 2
output: def find_last_index(lst, element):
      for i in range(len(lst) - 1, -1, -1):
          if lst[i] == element:
              return i
      return -1