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, 4, ['2419', '643', '8177', '7291', '561', '6529', '4101', 'u', '6445']

SOLUTION: 19277718

PROBLEM: 4, 9, ['9213', '2865', '1347', 'Y', 'A', '6261', 'E', 'w', 'r', 'B', 'j', '9157', 'r', '485', '8951']

SOLUTION: rwE1626AY

PROBLEM: 7, 11, ['U', 's', '1269', 'a', '541', '5039', 'X', '1983', '3835', '9727', '5843', '1861', '8297', 'x', '9805', 'L']

SOLUTION:
3485727953833891X