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]: 10, 13, ['D', 'A', '4221', '7301', '1937', 'r', '5105', 'q', 'F', 'j', '9441', '6391', '7081', 'l', '6569', 'i', '8871', '5985']
[EX A]: 180719361449j

[EX Q]: 11, 12, ['z', 'y', 'R', '6287', '4197', '3293', '3153', 'K', '4947', '9051', 'w', '2343', '8697', '3145', '9297', 'Y', '5789', 'r', '4249', 'Y', 'Z', '5041']
[EX A]: 3432w

[EX Q]: 7, 12, ['N', '543', 'z', '9235', 't', 'G', 'Z', '8797', '5593', '8755', '8315', 'u', '3943', 'l', '8627', '2963', '9693', '6365', 'i', 'b', '4605', '7579', 'b', '361']
[EX A]:
u5138557839557978Z