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.
13, 21, ['7691', '7939', '7433', 'a', 't', '7083', 'c', '2453', '3025', 'O', 'H', 't', 'D', 'G', 'c', '3931', 'e', '7649', 'e', 'S', 'H', '9813', 'j', 'a', 'v', 'n', '29', 'o', 'k', '949']