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: 7, 14, ['1541', 'd', '281', '3887', 'B', 'K', '9069', 'F', '5481', '9131', 'b', 'O', '543', 'a', '2677', 'L', '8361', '949', '9237', 'd', '5399']

a543Ob91315481F9069