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]: 2, 2, ['w', 'e']
[EX A]: e

[EX Q]: 4, 5, ['1803', 'T', 'u', '1089', '5655']
[EX A]: 55659801

[EX Q]: 23, 25, ['8461', '5199', 'E', 'l', '5669', 'w', '9661', '7331', 'C', 'I', '9661', 'Z', '5897', '1553', 'd', '3073', 'H', 'A', '7367', 'r', 'j', 'Z', '9567', 'R', 'G', '5877', 'O', 'T']
[EX A]:
GR7659