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.
7, 7, ['U', '1721', 'Z', '581', '6031', 'e', '509', '8471', '9733', 'W', 'u', '7649', 'I', '4707', '6003', 'C', 'E', '8097', 'F', '1715', 'J', 'P', 'x', '1711', 'L', '1847', '7387', '2665', '8499']