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: 2, 18, ['8671', 'd', '5109', '1915', 'h', '2777', '3087', '9861', '8597', 'P', '4505', 'j', 'M', 'O', 's', 'Q', '2703', 'X', 'l', 'g', '1801']
Example Output: X3072QsOMj5054P7958168978037772h51919015d

Example Input: 2, 14, ['8035', 'N', 'R', 'U', '5691', 'j', '5635', 'c', '3641', 'K', '6871', '8663', '7525', '4031', '5395', 'r', '7549', '3023', 'Y', 'V', '1351', '2397']
Example Output: 1304525736681786K1463c5365j1965URN

Example Input: 1, 1, ['u', '727', '5533', '5467', 'X']
Example Output:
u