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, 17, ['781', '1949', '8017', 'I', 'F', 'k', 's', 'f', '9531', '3769', '8135', 'R', '7643', 'v', '6217', '4085', 'M', '1993']

SOLUTION: M58047126v3467R531896731359fskFI71089491

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: 9, 10, ['3917', '3049', 'Z', '2501', '6729', 'L', '2335', 'e', 'h', '8115', 'L', '8765', '5389', 'D', 'J', '267', '6019', 'y', 'e', '3779']

SOLUTION:
5118h