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: 3, 6, ['95', '1973', 'L', '8811', '2655', '2661', 'v', 'a', '1115', '7687', '8807', 'r']

SOLUTION: 166255621188L

PROBLEM: 18, 20, ['1111', '8387', 'Q', 'O', 'A', 'E', '7233', 'o', '5603', 'H', '5793', 'k', '5603', 'B', 'F', 'e', 'Q', 'w', '9253', '6559']

SOLUTION: 95563529w

PROBLEM: 8, 17, ['4407', '4443', '2129', '8933', 'l', '6291', 'p', '4701', 'R', 'P', '2125', '849', '5527', 'J', '9405', 'E', 'R', '2491', '2511', '1373', '3699', '1695']

SOLUTION:
RE5049J72559485212PR1074