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]: 5, 5, ['r', 'n', 'J', 'U', '3587', 'J', 'A', '9729', '2919', '1417', '2605', '2663', '9427', '4449', '8545', '8673', '3417', '5671', 'e', 'W', '6963', '6713', 'c', '5071', '2823']
[EX A]: 7853

[EX Q]: 2, 5, ['l', 'E', '729', 'U', 'z', '9729', '3247']
[EX A]: zU927E

[EX Q]: 7, 8, ['7169', 'X', '3363', '6275', '6211', '1695', 'N', '2475', 'S', 'd', 'L', '8161']
[EX A]:
5742N