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: 17, 21, ['5503', '2979', '6307', '633', 'n', '9339', '5829', '5291', '8967', 'i', '9063', '975', 'G', '9187', '3227', 'A', '3487', '8187', 'H', '6097', 'H']
Example Output: H7906H78187843

Example Input: 1, 4, ['63', '5429', '5563', '2045', '875', '7163', '1869']
Example Output: 54023655924536

Example Input: 3, 19, ['s', 't', '4875', '741', '7193', 'K', '7965', '6423', 'S', 'p', '7725', 'x', '4235', '8979', 'U', 'b', 'X', 't', '2957']
Example Output:
7592tXbU97985324x5277pS32465697K39171475784