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, 9, ['1245', '5063', '9503', '5031', 'm', '1931', 'y', '4977', '8957', 'C', 'q', '7321', 'a', 'W', 'Z', '9897', 'c', 't', '9397']

89574977y