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, ['c', '3689', '1105', 'y', '8131', '5979', '2433', 'e', '2363', 'S', 'm', '1129', '4981', 'C', 'N', 'l', 'b', '449', 'U', '7329', '9377', 'a', 'k']

7329U449blNC49811129mS2363e243359798131y1105