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, 21, ['y', '6753', 'M', 'h', '6749', '6405', '4451', '719', '3309', '2133', 'n', 'x', '2101', '8717', '7315', 'Q', '2235', 'f', 'a', '6021', '2709', 'q', '1317', '1101']

27096021af2235Q731587172101xn21333309719445164056749hM