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]: 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]: 14, 15, ['5603', '5829', 'U', 'A', '917', '7489', '2267', 'F', '6993', 'C', '2397', '875', '7463', 'r', 'l', '2007', '5417', 'p', '2671', 'k', '8873', 'c', '3227', '2565', 'Y', 'e', '5703', '3675', 's', '5047']
[EX A]:
lr