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: 2, 12, ['f', '1687', '819', 'N', 'w', '6089', '6725', 'p', '8625', '5327', 'r', '8103', 'd', '1441', 'v', 'k', '3407', '5891', 'X', '6419', 'e']

SOLUTION: 3018r72355268p52769806wN9187861

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: 1, 18, ['G', '8555', '1525', '1893', '9367', '5747', '4885', '6841', '795', 'H', '977', '4583', 'b', 'P', 'T', 'H', 'L', 'u', 'r', '4339']

SOLUTION:
uLHTPb3854779H5971486588474757639398152515558G