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: 1, 2, ['k', 'A', '2153']

SOLUTION: Ak

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: 5, 17, ['P', '5341', '8281', 'G', 'G', '8353', '4393', 'x', '1899', '931', '1311', 'P', '7551', 'B', 'f', '7463', '6761', '5781', '3065', 'G', 'P', 'd', 'Z', '9']

SOLUTION:
16763647fB1557P11311399981x39343538G