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]: 1, 1, ['4571', '3997']
[EX A]: 1754

[EX Q]: 3, 5, ['j', '239', '9689', 's', 'C', 'w']
[EX A]: Cs9869

[EX Q]: 4, 7, ['7827', '5139', 'W', 'j', '1477', '5485', '1139', 'F', '6465', 'm', '2985', '6957', 'd', '1423', 'Y', '8641', 'G', '3509']
[EX A]:
931158457741j