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: 4, 7, ['3421', '6129', '593', '203', '2731', '1393', '9739', '1087', '3453', '1389', 'W', 'D', 'b', '9261']

SOLUTION: 937939311372302

PROBLEM: 6, 16, ['y', 'M', '5237', '1935', '4057', 'W', '1937', '6517', '717', 'i', '8255', '1011', 'A', '3537', '2411', 'U', 'J', 'a', '1591', '2299', 'W', '8383', '8579', '8183', '7473']

SOLUTION: U11427353A11015528i71771567391W

PROBLEM: 8, 16, ['7207', '2467', '9033', 'Q', '8469', 'F', '5997', 'B', '8901', '5643', 'e', '6357', 's', 'k', 'd', '8547', 'Z', 'r', '613', '3999', '6893', 't', 'q', 'w', 'A']

SOLUTION:
7458dks7536e34651098B