Given the task definition and input, reply with output. In this task, you are given inputs 'i', 'j', and A, where 'i' and 'j' are integers and A is a list. A list is shown by two brackets and comma-separated numbers and characters inside, like ['1', '12', 'l']. You need to concatenate all elements of A from the ith element to the jth element, and then reverse the resulting 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 reverse first and then concatenate.

3, 15, ['X', '6555', 'q', '3999', 'x', '9453', 'Y', '781', '2697', '5763', '7765', 'p', '9581', 'z', '3051', 'E', '1779', 'e', '539', '9539', '3917', '2707', '897', '9027', '1115']

1503z1859p567736757962187Y3549x9993q