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: 12, 15, ['L', 'd', '6287', 'i', '3647', '6621', 'R', 'I', 'M', 'X', '2419', '1097', 'w', '4639', '265']

2654639w1097