Create a function that retrieves every number that is strictly larger than every number that follows it.
largerThanRight([3, 13, 11, 2, 1, 9, 5]) ➞ [13, 11, 9, 5]
// 13 is larger than all numbers to its right, etc.
largerThanRight([5, 5, 5, 5, 5, 5]) ➞ [5]
// Must be strictly larger.
// Always include the last number.
largerThanRight([5, 9, 8, 7]) ➞ [9, 8, 7]
The last number in an array is trivially strictly larger than all numbers that follow it (no numbers follow it).