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, ['v', '127', 'C', 'u', '4611', 'e', '601', 'n', '9697', 'i', '8745', 'Q', '2691', 'O', 'c', 'M', 'C', '4829', '3147', 'p', '8733', '2907', '9417']

8733p31474829CMcO2691Q8745i9697n