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.

3, 6, ['p', 'H', '2775', '2567', '7787', 'D', '3807', '4817', '5399']
D787776525772

3, 21, ['V', '3661', '3743', 'Y', '3179', 'b', '7097', '3031', '5859', '4095', 'D', 'J', '2337', '4259', '2539', 'I', '9659', 'U', 'G', 'Q', '3145', '177', '9839', 'f']
5413QGU9569I935295247332JD5904958513037907b9713Y3473

4, 9, ['f', '1545', 'h', '5757', 'a', 'w', 'g', '1715', '7927', '6993', 'C', '1841', 'b', 't', '1675', 'a', '6053', '3175', '9513', '9233']

72975171gwa7575