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.
3, 19, ['q', '7961', '4441', '6585', 'p', 'O', '8717', 'I', 't', '3993', 'b', 'M', '7955', 'f', '1849', 'z', 'b', '3997', 'k', '6913', '9723', '2273', '7459']