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]: 13, 20, ['8627', '7993', 'N', 'p', 'n', 'v', 'T', 'L', 'z', '2929', 'a', 'D', '8465', 'R', '8803', 'q', '1069', 'p', '7231', '9581', '1689', 'b', '8773', 'P', 'a', 'L', 't']
[EX A]: 18591327p9601q3088R5648

[EX Q]: 9, 13, ['9007', '2291', '1683', 'f', 'k', 'K', '6167', 'l', 'v', 'a', '2959', 'u', 's', '5411', 'f', 's', 'I', '2725', 'k', 'D']
[EX A]: su9592av

[EX Q]: 6, 12, ['B', '9943', 'k', '8107', '751', 'Y', 'c', '2785', 't', '5225', 'x', '4709', '5081', '2259', 'f', 'M', 'W', '5413', 'a', '9131', 'F', 'n', '29', '5941', 'J', '533', '7187']
[EX A]:
9074x5225t5872cY