input: Write a python function to find the largest number and its position in a sequence.
  assert find_largest_number_and_position([3, 2, 5, 1, 9]) == (9, 4)
  assert find_largest_number_and_position([10, 20, 30, 40, 50]) == (50, 4)
  assert find_largest_number_and_position([1, 1, 1, 1, 1]) == (1, 0)
output: def find_largest_number_and_position(sequence):
      largest_number = max(sequence)
      position = sequence.index(largest_number)
      return (largest_number, position)