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, 9, ['P', 'O', '539', '8947', 'p', 'B', 'H', 'Z', '2999', '699', '9935', '6379', 'd', 'f', 'G', 'S', 'p', 'Y', '897', '7919', '1209', '2903']

2999ZHBp8947539