You are given the array-like data structure Listy, which does not have a size. method. It does, however, provide an elementAt I function that returns the element at index I in the array of elements.  0( 1) time. If I exceeds the data structure's boundaries, it returns -1. (As a result, the data  structure only works with positive numbers.) Given a Listy of sorted positive integer , Determine the index at which an element x appears. If x happens more than once, you may return any index.

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