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.

Example Input: 2, 2, ['2475', '621']
Example Output: 621

Example Input: 6, 15, ['7417', 'a', '479', 'E', '1575', '6937', '4649', '9879', '9875', 'c', '1671', 'K', '3773', '6999', 'J', '9889', 'q', '4099', 'r', '1859', 'W']
Example Output: J69993773K1671c9875987946496937

Example Input: 11, 20, ['9431', 'r', 'c', '3557', 'o', '1243', 'E', '9803', 'Q', 'p', 'e', 'b', 'c', '7215', 'U', 'U', 'h', 'o', '8115', '3551', '7373', '4553']
Example Output:
35518115ohUU7215cbe