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: 5, 12, ['U', 'h', 'z', 'S', '5377', 't', '765', '2913', 'a', '9551', '8191', '4903', '9995', '1143', '2919', '67', '8619', 'c', 'n', '901', '3993']

490381919551a2913765t5377