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: 2, 12, ['O', '5837', '7067', '805', '9555', '9447', '6057', 'y', '5433', '1529', '4215', '1709', '8785', 'n']

1709421515295433y60579447955580570675837