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, ['s', '7195', 'u', 'M', 'R', '5713', 'f', 'f', '6955', 'w', '9579', 'e', 'b', 'W', 'x', 'O', 'h', 'S', '1019', '5067', '3781', '229', 'u', '4411', 'I', '6349', '8397', '9689', '421']

ShOxWbe9579w6955ff5713