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]: 5, 6, ['7565', '6525', '7421', 'u', '303', '1815', '273', '6725', 'i']
[EX A]: 5181303

[EX Q]: 7, 12, ['C', '1817', 's', 'n', '5545', 'l', '1921', '6177', 'x', 'q', '4013', 'O', 'L', '6921', '1549', '7045', 't', '3673', 'x', 'T', 'O', '9609', '8149']
[EX A]:
O3104qx77161291