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]: 4, 16, ['M', '1253', 'L', '1997', 'E', 'u', '4953', '1627', '4497', '1839', 'M', 's', '9821', '9159', '845', '6189', 'F', 'G', 'E', '2303', '503']
[EX A]: 981654895191289sM9381794472613594uE7991

[EX Q]: 1, 7, ['4177', 'T', 'Q', '915', '7823', 'm', '6453']
[EX A]: 3546m3287519QT7714

[EX Q]: 1, 4, ['8733', 'D', '9361', '4409', '431', 'X', '845', '2617', '707', '8549', 'a']
[EX A]:
90441639D3378