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, 21, ['4979', '5243', '8481', 'I', '8819', 'P', '9195', '1721', 'J', 'D', '6113', 'A', '2497', 'F', '6007', 'J', '8457', 'F', '3909', '1993', '8105']

810519933909F8457J6007F2497A6113DJ17219195P8819I8481