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: 18, 18, ['O', '7845', 'f', '2313', 'f', '9661', 's', 'O', '6009', '6997', 'f', 'T', 'f', '6517', 'E', 'H', 'k', 'Y', 'i', '2839', '1839', '3251', 'H', '1939']
Example Output: Y

Example Input: 3, 8, ['b', 'y', '8779', '3949', 'c', 'a', '111', '6649']
Example Output: 9466111ac94939778

Example Input: 10, 14, ['2745', '8135', 'K', 'I', '1757', 'b', 'P', '6733', 'o', '4983', '1601', 's', 'P', '3015', 'f', 'f', 'p', 'o', 'G', '1935']
Example Output:
5103Ps10613894