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, 5, ['j', '239', '9689', 's', 'C', 'w']

SOLUTION: Cs9869

PROBLEM: 5, 7, ['u', '3017', '4149', 'z', '9231', 'C', '7461', 'e']

SOLUTION: 1647C1329

PROBLEM: 6, 6, ['5471', '477', 'L', '1187', 'V', '6911', 'b', 'O', '3749']

SOLUTION:
1196