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, ['y', 'I', '4135', '6197', '8567', '7697', '4735', '2307', '4789', 'h', 'c', '6219', '4021', '3919', 'Y', 'e', 'H', 'm', '7525', '7803', 'p', '6957', 'J', '669', '663', 'B', '693', '4753']

mHeY391940216219ch4789230747357697