TASK DEFINITION: In this task, you are given inputs 'i', 'j', and A, where 'i' and 'j' are integers and A is a list. A list is shown by two brackets and comma-separated numbers and characters inside, like ['1', '12', 'l']. You need to concatenate all elements of A from the ith element to the jth element, and then reverse the resulting 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 reverse first and then concatenate.
PROBLEM: 19, 23, ['r', '521', '2357', 'j', 'R', 'a', '4853', 'q', '2383', 'i', '8071', '3715', '7533', '1407', 'e', '9495', 'k', '3789', 'P', 'c', '2565', 'q', '4565', 'P']

SOLUTION: 5654q5652cP

PROBLEM: 4, 20, ['p', '1643', 'O', '5867', 'Y', 'j', '2411', 'Z', '2563', '4757', 'B', 'b', '7489', '815', 'c', '6631', '8571', '6537', 'm', 'T']

SOLUTION: Tm735617581366c5189847bB75743652Z1142jY7685

PROBLEM: 3, 21, ['L', 'k', 'A', '759', '1275', '2001', '7133', 'T', 'O', '7653', 'p', 'T', 'V', 'H', '2653', 'O', 'u', '1515', 'T', '1083', '1497', '1673', 'c', '309', 'g', '8635']

SOLUTION:
79413801T5151uO3562HVTp3567OT331710025721957A