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: 3, 20, ['k', 'O', 'q', '7611', '2579', '5497', '6827', '631', '5619', 'E', '5815', 'b', 'f', 'L', '3439', 'n', 'G', 'A', 'C', 'q', '9921', 'E']

qCAGn3439Lfb5815E56196316827549725797611q