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: 10, 15, ['W', '8633', '6575', 'm', '2569', 'M', 'S', '937', 'O', 'O', '573', '625', 'W', '5861', '4219', 'p', 'U', '7421']

42195861W625573O