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: 3, 12, ['g', 'n', 'f', 'l', '2279', 'Z', 'M', '1029', '6721', '539', '8051', '9257', 'T', '8889', '9565', 's', 'H', 'T']

9257805153967211029MZ2279lf