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: 21, 23, ['b', '3061', '8041', 'U', '7087', 'D', '615', 'p', '7403', '9519', '8179', '4721', '4855', '6689', '7179', '4783', 'p', '2693', '8217', '3535', '4863', '7833', 'i', '4397', 'l']

i78334863