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]: 14, 15, ['3351', '8899', 'M', 'm', '2939', 'e', '1681', '9189', 'b', 'j', 'L', '1927', '2855', '2993', 'F', 'P', '3261', '3185', 'U', '8887', 'M', '9865']
[EX A]: F3992

[EX Q]: 1, 3, ['8015', 'y', 'r', '8077', 'U']
[EX A]: ry5108

[EX Q]: 1, 10, ['E', '1773', 'a', '6567', '4087', '3797', '245', 'L', '8907', 'T', '6369', '3527', '4853']
[EX A]:
T7098L542797378047656a3771E