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: 6, 19, ['1247', 'w', '6657', '3757', '9313', 'u', '5655', 'n', '9559', '4017', '9041', 'n', 'w', '155', 'C', 'N', '6351', '9761', '5701', '3857', '6167', 'u']

SOLUTION: 107516791536NC551wn140971049559n5565u

PROBLEM: 3, 8, ['b', 'y', '8779', '3949', 'c', 'a', '111', '6649']

SOLUTION: 9466111ac94939778

PROBLEM: 2, 4, ['8395', 'c', 'S', 'C', '8063', 'y', '6241', 'R', '3981', 'H', '1569', '9949', 'W', '45', '5157', 'X', '7677', 'K', 'F', '8677', '6513', 'M', 'd', '8951', 'n']

SOLUTION:
CSc