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, ['L', 'b', '6879', '6807', 'x', '1363', '7413', '8753', '457', 'C', '3217', 'p', 'r', '9669', '3805', 'L', '2147', '5813', '2197']

58132147L38059669rp3217C45787537413