In this task, you are given inputs 'i', 'j', and A, where 'i' and 'j' are integers and A is a list. A list is shown by two brackets and comma-separated numbers and characters inside, like ['1', '12', 'l']. You need to concatenate all elements of A from the ith element to the jth element, and then reverse the resulting 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 reverse first and then concatenate.

Example Input: 1, 8, ['7991', '7999', '8575', '4211', '6003', '2483', '7877', '7249', 'K', '21']
Example Output: 94277787384230061124575899971997

Example Input: 4, 20, ['H', '7451', 'X', 'i', '951', '1913', '9949', 'W', '4759', '1309', '1981', 'C', 'J', 'F', '4125', 'l', 'i', 'z', 'S', 'R', '5025', '5959', '1323', 'K', 'O', 'x', '5121', 'c', 'C']
Example Output: RSzil5214FJC189190319574W94993191159i

Example Input: 2, 5, ['q', 'B', '6439', '7227', '4853', 'a', '7669', '4413', 'j', '167', '7741', '4543', '2951', '3403', '8365', 'n', 'T', '1203', '1093', '4163', 'W', '7735', 'l', '7763']
Example Output:
358472279346B