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, ['3579', 'R', '1097', 'p', '1683', '2699', 'z', '6061', '7943', 'Q', 'I', 'V', '1295', 'U', 'q', '2403', 'P', 'h', '6469', 'z', 'j']