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, ['l', '3863', '9673', 's', 'j', '6039', '6891', 'r', '3373', '401', '3659', 'r', 'T', '207', 'W', '289', 'p', 'U', 'w', '3757', '9865', 'X', 'M', '9289', 'p', '6491', '6403', 'I', 'k']