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.

Example Input: 3, 21, ['V', '3661', '3743', 'Y', '3179', 'b', '7097', '3031', '5859', '4095', 'D', 'J', '2337', '4259', '2539', 'I', '9659', 'U', 'G', 'Q', '3145', '177', '9839', 'f']
Example Output: 5413QGU9569I935295247332JD5904958513037907b9713Y3473

Example Input: 2, 2, ['6099', 'r']
Example Output: r

Example Input: 5, 9, ['1685', '6607', '5295', '4961', '5423', 'j', '3755', 'Q', 'c']
Example Output:
cQ5573j3245