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, 19, ['6807', 'i', '6915', '917', '8771', 'H', '5835', '553', '3457', 'e', '1639', 'i', 'R', 'm', 'B', 'e', '2173', 'I', '5503', 'R', '1657', 'a', '3761', 'o', 'K', '4265', 'W']

5503I2173eBmRi1639e34575535835H87719176915i