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: 3, 19, ['4715', '2187', '8665', '8939', 's', '9793', '9137', '1193', '9917', '2987', 'Y', 's', '6757', 'x', 'n', '187', '877', '533', 'p', 'o']

p533877187nx6757sY29879917119391379793s89398665