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: 7, 19, ['y', 'B', 'i', 'q', '9019', 'T', '5019', 'D', '9523', '5757', 'W', '3129', 'x', 'H', '9015', 'Y', '5017', '9181', '2309', '6795', 's', 'E', 'l', 'H', 'F', '8001', '5239', '8823', 'U']

230991815017Y9015Hx3129W57579523D5019