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.
21, 23, ['N', '4339', '6863', '41', 'y', '3467', '6203', 'U', 'q', '9543', '3947', 'X', 'Y', 'k', '4949', 'L', '2321', '5527', 'd', 'J', '4543', '7673', 'm', '9343', 'k', '1685', 'S', 'x', 'c', '67']