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]: 2, 11, ['6519', 'l', '6577', 'z', '4271', 'R', 'O', '7809', 'K', 'V', '4531']
[EX A]: 1354VK9087OR1724z7756l

[EX Q]: 11, 14, ['c', '6897', 'S', 'J', 'F', '5099', 'b', 'M', 's', 'h', '7725', '3313', 'a', 'o', 'p', '2135', 'I', 'E', 'G', '2273', '9799', '1027', '3431', '6795', 'o', 'k', '3559', 'd']
[EX A]: oa31335277

[EX Q]: 2, 2, ['n', '1261', 'H', '5933', 'F', '1743', 'z', '8013', 'c', '201', 'V', '6813', '3623', 'v', 'q', 'X', '5379', 'l', 'u']
[EX A]:
1621