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, 5, ['j', '239', '9689', 's', 'C', 'w']
[EX A]: Cs9869

[EX Q]: 5, 7, ['u', '3017', '4149', 'z', '9231', 'C', '7461', 'e']
[EX A]: 1647C1329

[EX Q]: 9, 13, ['2461', '4997', 'X', 'L', 'l', '7219', 'M', '7857', '2361', '7991', '1721', 'z', 'b']
[EX A]:
bz127119971632