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, 4, ['I', '5919', 'J', '6387']
[EX A]: 7836J9195I

[EX Q]: 4, 5, ['1803', 'T', 'u', '1089', '5655']
[EX A]: 55659801

[EX Q]: 2, 10, ['i', '473', 'E', 'D', '9089', '2497', 'q', 'm', 'O', '1609', 'V', 'o']
[EX A]:
9061Omq79429809DE374