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

[EX Q]: 15, 19, ['s', '2569', '1713', 't', 'R', 'G', '5779', 'o', '2667', 'W', '9283', '2419', '6745', 'f', 's', '4131', '8337', 'q', '5275', 'Y', 'N', 'k', 'K', '1937', '3983', '759', '471', 'J', '3213']
[EX A]: 5725q73381314s

[EX Q]: 3, 6, ['m', 'L', '2311', '2329', 'G', 'Q', 'k', 'w', '6863', 'I', '9753', 'P', 'E', '2741', 'B', '2935', 'f', 'c', '49', '9803', '409', '9123', 'B', 'f', 'i', 'n']
[EX A]:
QG92321132