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: 6, 18, ['v', 'p', 'H', '3347', '8843', '1569', '7463', '6019', '59', '1677', '3705', '4931', '9347', 'H', '5565', '5015', 's', 'I', 'f', 'm', '6869', 'L', '6625', 'C', 'E', 'k']

Is50155565H934749313705167759601974631569