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]: 30, 30, ['7149', 't', 'W', '5821', '1189', '4423', 'T', 'x', '5131', '9015', 'H', 'k', 'J', '9951', '5697', '1953', 'X', '8691', '3581', '7319', '6977', '8031', '6179', '2109', 'F', 'Y', 'G', '1065', 'y', '869']
[EX A]: 968

[EX Q]: 3, 6, ['z', 'b', '2697', 'W', '1449', 'x', '5327']
[EX A]: x9441W7962

[EX Q]: 15, 17, ['7899', '6549', 'v', '5377', '6539', '5393', 'L', 'N', 'P', '9499', '1401', 'I', '2453', '8169', '5957', 'c', '6073', 'Q']
[EX A]:
3706c7595