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, 18, ['R', '7241', 'A', 'z', '8115', '6251', 'F', '1405', 'N', '3567', '1525', 'a', '6057', 'E', '5637', '4969', '3499', '5489', 'Z', 'K', 'M', 'I', 'Z', 'j']
[EX A]: 9845994396947365E7506a52517653N5041F15265118zA

[EX Q]: 8, 12, ['K', 'x', 'a', 'A', '6203', '117', '1007', '6063', '569', '9809', '9097', 'w', '3939', 'l', 'V']
[EX A]: w790990899653606

[EX Q]: 11, 15, ['1039', 'H', '5209', 'q', '2553', 'k', '5253', '4049', '2955', '4457', 'u', '8193', '4337', '1271', 's', 'X', '2613', '4653', '9403', '5225', '201', 'C', 'x', '5689', '1387']
[EX A]:
s172173343918u