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.
16, 21, ['4235', '9403', 'f', '5401', '1973', '65', 'n', '3935', 'p', 'c', '1651', '7315', 'U', '8227', 'N', '2067', 'Y', '8227', '2199', 'U', '2607', 't', '245', 'Y', 'Z', '5609', 'n', '8297', '7571']