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.

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


[Q]: 4, 4, ['w', '3895', '4989', '7875', 'u']
[A]: 5787


[Q]: 21, 21, ['4621', 'a', '1087', '575', 'E', 'M', 'j', 'H', '1853', '8499', 'e', '899', '9583', '3945', 'S', 'x', 'V', '1433', '5711', 'b', 'x', '6657', '899', '8701']
[A]:
x