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.

Example Input: 1, 12, ['f', '8665', '6205', 'L', 'y', 'P', '9351', 'k', '1387', '657', 's', 'k']
Example Output: ks7567831k1539PyL50265668f

Example Input: 10, 19, ['6733', 'q', '2197', 'h', '9975', '3059', 'e', '8475', '281', 'L', '9119', 'B', '8857', 'U', 'R', 'h', 'e', 'J', 'P', 'l']
Example Output: PJehRU7588B9119L

Example Input: 6, 10, ['E', 'w', 'x', '6123', '6333', '3855', 'h', '45', '7883', '9169', '6631', 'C', '3981', 'h', 'u', 'n', '5635', 'I', '6921', '5465', 'B', 'h', '1471', 'Z', 'X']
Example Output:
9619388754h5583