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]: 6, 10, ['4631', 'q', '4689', 'w', '499', '3383', '8091', '7699', 'H', '6359', 'I', '267', 'v', '3295', 'H', '4815', 'u', 'o', '5023', 'n', '9471', '7435']
[EX A]: 9536H996719083833

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

[EX Q]: 1, 3, ['2639', '5187', 'V', '7001', 'w', 'U', '7581', 'b', '4711', '6335', 'C', '9823', 'N', '4319', '2275', '6301', '8615', 'N', '9769', '6413', '8675', '6307', '4169', 'p']
[EX A]:
V78159362