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: 18, 20, ['7927', 'y', '6505', 'A', 'y', '8847', 'i', 'K', 'B', 'p', 'o', '6945', 'q', '5535', '7283', '2057', '6553', '6525', '8661', '9407', 'c', '4625', 'A']

940786616525