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.
7, 12, ['x', '1791', 'J', 'l', '417', '1987', '3221', '3537', 'B', '1829', '4209', 'E', 'p', 'O', '8059']