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: 4, 7, ['3915', 'F', '1229', 'J', 'F', 'R', '7841', '4173', '9385', '6455', '8989', '9123', 'B', '5705', 'E']

7841RFJ