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]: 9, 13, ['z', '2819', '4327', 's', '9271', '3601', '2475', 'L', '7129', '7513', '6649', '9333', '9507', '2411', 'L', '1905', '7315', '6663', '4511', 'h', 'h', '4345', 'd', 'I']
[EX A]: 70593339946631579217

[EX Q]: 18, 20, ['1111', '8387', 'Q', 'O', 'A', 'E', '7233', 'o', '5603', 'H', '5793', 'k', '5603', 'B', 'F', 'e', 'Q', 'w', '9253', '6559']
[EX A]: 95563529w

[EX Q]: 19, 21, ['9001', 'x', '2985', '2065', '6209', '2617', '637', '8665', '2811', 'A', '7715', 'V', '4935', 'Q', 'L', '2563', 'L', 'M', 'A', '6005', '1601', 'z']
[EX A]:
10615006A