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.
15, 20, ['7183', 'Y', '3535', '9939', '4973', 'E', '939', 'h', 'M', 's', '8557', 'C', '4687', 'M', '6739', 'B', 's', '7471', 'F', 'Q', 'I', '2961', '4699', '2497', '9923', 'M', '2165', 'x', '6349', '1821']