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: 9, 21, ['X', 'm', 'I', '8573', '3337', 'y', '1449', 'w', 'S', '7051', 'A', '2179', '9155', '5407', 'A', 'U', 'N', 'g', '5687', '1631', 'p', '3111', 'v', '4653', '2249', '1511', 'h', 'a', 'v']

p16315687gNUA540791552179A7051S