Definition: In this task, you are given inputs i, j, and A, where i and j are integers and A is a list. You need to find all elements of A from the ith element to the jth element, reverse the order in which they occur, and then concatenate them to output the resultant string. i and j will be non-negative, and will always have a value less than the length of A. i will always be less than j. Perform the operations in order, i.e., do not concatenate the elements and then reverse the string.
Input: 4, 12, ['B', '1507', '5003', 'C', 'a', 'I', 'G', 'a', '8459', 'J', '9383', '4219', '7075', 'f', 'x', '3885']

42199383J8459aGIaC