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: 15, 21, ['d', '609', 'Q', '6031', '629', 'I', 'M', '7403', '9155', 'w', 's', 'v', 'd', 'm', '5551', '9701', 'D', '7849', '9675', '1671', '3557']

3557167196757849D97015551