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: 12, 19, ['1013', '1603', '1439', '8689', 'k', '9721', '4587', '3287', 'b', 'Y', '445', 'r', 'm', '1503', 'f', '5035', 'C', '8025', 'b', '7853', '8357', 'u', 'F']

b8025C5035f1503mr