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]: 3, 7, ['P', 'P', 'H', 'r', '3563', 'n', 'M', '1577', '6453']
[EX A]: Mn3653rH

[EX Q]: 5, 8, ['1861', '2831', '6423', '9641', 'o', 'J', '8215', '4149', '5345', '4371', '7747']
[EX A]: 94145128Jo

[EX Q]: 1, 3, ['K', 'z', 'X', '9087', 'y']
[EX A]:
XzK