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.

[EX Q]: 3, 21, ['V', '3661', '3743', 'Y', '3179', 'b', '7097', '3031', '5859', '4095', 'D', 'J', '2337', '4259', '2539', 'I', '9659', 'U', 'G', 'Q', '3145', '177', '9839', 'f']
[EX A]: 5413QGU9569I935295247332JD5904958513037907b9713Y3473

[EX Q]: 11, 14, ['c', '6897', 'S', 'J', 'F', '5099', 'b', 'M', 's', 'h', '7725', '3313', 'a', 'o', 'p', '2135', 'I', 'E', 'G', '2273', '9799', '1027', '3431', '6795', 'o', 'k', '3559', 'd']
[EX A]: oa31335277

[EX Q]: 3, 12, ['1905', '3357', 'Y', 'v', '8217', 'K', '1395', 'o', 'h', '3095', 'h', 'a', 'H', '335', 'C', '1629', 'x', 'A']
[EX A]:
ah5903ho5931K7128vY