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, ['6843', '7805', 'h', '9097', 'O', 'u']

SOLUTION: uO7909h

PROBLEM: 10, 15, ['1135', 'N', '4053', 'k', 'V', '2313', '4827', '549', '23', '223', 'y', 'L', 'r', '7031', '7605']

SOLUTION: 50671307rLy322

PROBLEM: 6, 9, ['9765', '2873', '9053', '8195', 'B', 'W', 'A', 'B', 'a', 'L', 'U']

SOLUTION:
aBAW