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.

Example Input: 2, 18, ['8671', 'd', '5109', '1915', 'h', '2777', '3087', '9861', '8597', 'P', '4505', 'j', 'M', 'O', 's', 'Q', '2703', 'X', 'l', 'g', '1801']
Example Output: X3072QsOMj5054P7958168978037772h51919015d

Example Input: 2, 12, ['W', 'R', 'P', '9411', '179', '5175', '7959', 'o', '4285', 'H', '7535', '3423', 'Q', '7813', '611']
Example Output: 32435357H5824o959757159711149PR

Example Input: 1, 6, ['k', 'J', 'G', '5491', '7565', 'q', 'n', 'C', '7679', '3253', 's', '7271', '5235', '2741', 'A', 'E', '9395', 'd', '3549', 'y', '8563', 'N', 'y', '4503', '1501', '2657', 'F', 'i', '4517', '3899']
Example Output:
q56571945GJk