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: 2, 12, ['4203', '6001', 'p', 'b', '3715', '8547', '2501', '2617', '2147', '2661', 'j', 'p', '8121']

pj266121472617250185473715bp6001