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.
19, 23, ['q', 'v', '5813', '3773', '8367', '9619', '307', '4065', 'P', '7139', '4021', 'a', 'r', '3615', '2427', '2403', 's', '6439', 'W', '9481', '4361', 'm', '269', 'r', 'r', '7831']