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: 1, 4, ['I', '5919', 'J', '6387']
Example Output: 7836J9195I

Example Input: 1, 5, ['7115', '3109', '3805', '6831', '6897', 'y', 'b']
Example Output: 79861386508390135117

Example Input: 3, 4, ['107', '1095', 'i', 'x', '727', '1785', '7611', 'Z']
Example Output:
xi