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: 9, 23, ['j', '2563', '2935', 'n', 'Q', 'P', '7263', 'p', 'q', 'W', 'Y', '8521', '3257', 'W', 'V', '4261', 'B', '1297', '4219', '5421', 'o', '237', '2129']

2129237o542142191297B4261VW32578521YWq