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, 21, ['f', '8179', '3993', '2027', '9141', '6831', '7737', '1401', 'p', '8293', '1961', '4673', 'S', 'q', 'o', '4335', 'K', '757', 'e', 'B', '719', '3785', '2445', '9247', '3555', '7511', '6117']

719Be757K4335oqS467319618293p1401773768319141202739938179