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 Input:
6, 8, ['J', '4955', '3497', '8869', 'n', '2093', '6249', 'A', '8957']

Ex Output:
A94263902


Ex Input:
1, 4, ['63', '5429', '5563', '2045', '875', '7163', '1869']

Ex Output:
54023655924536


Ex Input:
1, 9, ['6373', 'K', 'w', '8905', 'g', 'U', '7437', 'O', 'D']

Ex Output:

DO7347Ug5098wK3736