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.

1, 5, ['7115', '3109', '3805', '6831', '6897', 'y', 'b']
79861386508390135117

5, 5, ['r', 'n', 'J', 'U', '3587', 'J', 'A', '9729', '2919', '1417', '2605', '2663', '9427', '4449', '8545', '8673', '3417', '5671', 'e', 'W', '6963', '6713', 'c', '5071', '2823']
7853

15, 16, ['7511', 'P', 'z', '8995', '2449', 'C', 'd', 'U', '6091', 'g', 'g', '6035', '6153', '1587', '9713', '7887', '5985', 'n', 'U', '3669', '7617', '8095', 'w', 'Y', '8601']

78873179