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: 12, 18, ['D', 'c', '5445', '505', 's', '5313', '6437', '7217', '2023', 'E', 'P', 'n', 'e', 'A', 'F', '7121', 't', '8599', '9923', '2049', 'Q', '4009', '95', '7937']

8599t7121FAen