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, 2, ['6627', 'J']
Example Output: J7266

Example Input: 2, 3, ['N', 'U', 'D', 'm', '9001', 'I', '2675', 'l', '2771', 'U', '1181', 'U']
Example Output: DU

Example Input: 5, 21, ['A', '2055', '6311', '4251', 'd', 'N', 'i', '5081', 'Y', 'e', '5841', '1659', '1145', 'L', '7947', 'X', '399', '6977', '297', 'f', '8171', 'L', 'B', 'h', '3587']
Example Output:
1718f7927796993X7497L541195611485eY1805iNd