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]: 1, 2, ['L', '7723']
[EX A]: 3277L

[EX Q]: 6, 7, ['753', '4657', 'h', '13', '593', 'I', '7689', '717']
[EX A]: 9867I

[EX Q]: 5, 12, ['Z', 'g', 'S', 'm', 'k', 'Z', '9519', '2273', 'X', 'O', 's', 'w', 'i', 'e', '8621']
[EX A]:
wsOX37229159Zk