An element of a list is called a "leader" if every element to its right (and not just the one immediately to its right) is strictly smaller than it. By this definition, the last element of the list is automatically a leader.
Example: list_leaders([42, 7, 12, 5, 2, 9]) returns [42, 12, 9] (because 42 > all other numbers to its right, 7 no, 12 > all numbers to its right, etc.)
Complete the function list_leaders(L) which returns the list containing only the leader elements (in the same order as in L).
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