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, 1, ['N', 'J']

SOLUTION: N

PROBLEM: 5, 8, ['1861', '2831', '6423', '9641', 'o', 'J', '8215', '4149', '5345', '4371', '7747']

SOLUTION: 94145128Jo

PROBLEM: 1, 15, ['5717', '2257', 'w', '7425', 'e', '9853', '1483', 'J', 'd', 'y', 'e', '2851', '5915', '93', '551']

SOLUTION:
1553951951582eydJ38413589e5247w75227175