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: 10, 10, ['7719', 'K', '7323', '7843', '7079', 'y', '6777', 'M', 'S', 'v', 's', '4857', 'J', '8269', 'm']
Example Output: v

Example Input: 8, 9, ['s', 'X', '6737', 'M', 'm', 'N', 'a', 'Q', 't']
Example Output: tQ

Example Input: 1, 18, ['o', '5077', '5605', 'k', 't', 'b', 'L', 'H', '1763', 'q', '8081', 'U', '1539', '9013', '8231', 'y', 'M', 'Q', 'u', '5509', 'r', '1799', '7877']
Example Output:
QMy132831099351U1808q3671HLbtk50657705o