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, 15, ['3207', 'v', '1869', '6417', '385', '1735', 'T', 'R', '5097', 'R', '9649', 'E', '3839', 'v', 'i', 'f', '2165', '673', '3029', '6759', 'X', '3637', '1999', 'r']

iv3839E9649R5097RT