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: 8, 20, ['K', '1123', 'S', '8651', 'x', '7079', 'q', 'C', '5941', 'D', 'w', '3121', '3089', 'S', 'b', '3367', 'Q', '4739', 'u', 'd']

du4739Q3367bS30893121wD5941C