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.
17, 21, ['8359', '4039', '7749', 'w', '8139', 'I', '3781', '6505', '5777', 'b', 'N', '9863', 'P', '9407', 'o', '2839', 'K', '5059', '4021', 'z', 'k', 'E', '9397', 'n', '139', 'M', '1813', '8729', 'K']