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: 11, 19, ['L', '7487', 'V', '3299', '8943', '4357', '9507', 'J', 'O', 'K', 'm', 'u', 'h', 'j', '4211', '8421', 'w', '9427', 'Y', 'F', '643', 'V']

Y9427w84214211jhum