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: 4, 13, ['u', '5315', '2273', '4711', '4697', 'I', 'Q', '7155', '25', 'D', '9879', 'q', 'j', 'Q', '1909', 'U', 'H', '6857', 'W']

jq9879D257155QI46974711