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, 4, ['5983', 'I', '9531', 'U', 'P', '1383', 'Y']
[EX A]: U1359I

[EX Q]: 1, 5, ['7115', '3109', '3805', '6831', '6897', 'y', 'b']
[EX A]: 79861386508390135117

[EX Q]: 7, 15, ['J', '6461', 'v', 'R', 'w', 'F', 'B', '1277', '1911', 'E', 'V', 'Y', 'a', '5755', '6503', 'm']
[EX A]:
30565575aYVE11917721B