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, ['2849', 'J', 'L', '2347', '7219', 'a', 'Q', 'U', '6865', 'O']

SOLUTION: 91277432L

PROBLEM: 16, 18, ['7121', 'b', 'P', '7771', 'l', 'I', '7817', '5185', '7989', 'H', '4449', '3859', '869', '9321', 'O', '6453', '6219', '8349', '5327', 'm', 'c', 'O', '1185', '2703', '9673', 'q']

SOLUTION: 943891263546

PROBLEM: 11, 19, ['7177', 'C', '7901', '7667', 'a', '6489', 'n', '1463', '6061', '6221', 'x', 'V', '6001', '1377', 'n', '1277', 'v', 'T', '9457', 'G', '5745', '2435', '1273', 't', '4309']

SOLUTION:
7549Tv7721n77311006Vx