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]: 5, 7, ['N', 'U', 'L', '1205', '7327', 'b', 'c']
[EX A]: cb7237

[EX Q]: 2, 17, ['6279', '2747', '9163', 'r', '9427', '1321', 'T', '7485', '9709', 'c', 'A', '305', '8575', 'W', '9275', '401', '8883']
[EX A]:
38881045729W5758503Ac90795847T12317249r36197472