Definition: In this task, you are given inputs i, j, and A, where i and j are integers and A is a list. You need to find all elements of A from the ith element to the jth element, reverse the order in which they occur, and then concatenate them to output the resultant 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 concatenate the elements and then reverse the string.
Input: 12, 30, ['c', 'W', '7669', 'm', '8245', '7977', '331', '6057', '4375', '2511', '7729', '6287', 'f', 'k', 'J', '3205', 'X', 'm', '3645', 'K', '2677', '6029', '3411', 'a', 'k', '8453', '8811', '5369', 'h', '9899']

9899h536988118453ka341160292677K3645mX3205Jkf6287