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: 8, 21, ['B', 'A', 'S', 'z', '7795', 'w', 'r', '6109', 'r', '5847', 'G', '8145', '8957', '4155', 'k', '4025', 'i', 'S', 'C', 'O', 'D', 'f', 'r']

DOCSi4025k415589578145G5847r6109