Create a function that finds each number in the given list that is greater than every number that comes after it. Your solution should return a list of the number(s) that meet these criteria.
leader([2, 3, 20, 15, 8, 3]) ➞ [20, 15, 8, 3]
# Note that 20 is greater than all the elements to it's
# right side, similarly 15 and so on.
leader([2, 3, 20, 15, 8, 25, 3]) ➞ [25, 3]
# Note that 20 cannot be added because it is not greater than 25.
leader([1, 2, 3, 4, 5]) ➞ [5]
# 5 is technically greater than the (zero) remaining items.
leader([8, 7, 1, 2, 10, 3, 5]) ➞ [10, 5]
# 10 is greater than all items to the right of it, so include.
# 3 is not greater than all items to the right of it, so exclude.
# 5 is greater than the remaining items, so include.
Add elements in the new list in the same order they occur in the input list.