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: 7, 18, ['C', '7681', 'n', 'C', 'w', '1483', 'Z', 'L', 'O', '313', 'f', 'A', 'R', '5509', '8827', 'm', 'n', '9423', 'j', '5871', '6691', 'e', 'f']

9423nm88275509RAf313OLZ