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, 16, ['5001', '9165', 'D', 'D', '3117', 'i', 'f', '6235', 'U', '1439', 'C', 'X', '1689', 'q', 'M', '7817', 'j', 'z', '7005']

7817Mq1689XC1439U6235fi3117DD