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: 9, 18, ['2893', 'F', 'q', '767', '8597', 'J', 'L', 'f', 'f', '7717', '2297', 'm', 'R', '159', '7767', '6481', '8665', 'B', '4909', '1867']

B866564817767159Rm22977717f