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.
8, 21, ['u', '8163', '6963', '5955', '6541', 'X', 'n', 'w', '2265', 'Y', '2589', 'Z', 'C', '9421', '1461', 'j', 'n', 'O', 'D', 'Y', '4177', '7583', '9667', 'D', '5779', 'j', '371', '7751', 'C', 'Z']