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: 5, 16, ['8475', 'y', 'z', 'M', '7495', 'p', '6073', '1545', '9065', '8957', 'z', 'Y', '863', '4153', '3381', '5513', 'K', 'H', '4083', '6175', 'H', '6463', 'G', '5217', 's', 'c']

SOLUTION: 315518333514368Yz7598560954513706p5947

PROBLEM: 13, 13, ['o', '1567', '1971', '5659', 'e', '5189', 'a', '617', 'z', 'Q', '1135', '7739', '1689', 't', 'T', 'C', '6001', 'x', '8549', '7189', '3891', 'S', 'Z', '3731']

SOLUTION: 9861

PROBLEM: 18, 20, ['c', '8973', 'z', '2213', '5571', 'm', 'H', '2955', 'E', '1969', 't', '8293', '2185', 'i', '5241', '1291', '8367', 'T', '1845', 's', '4099', 'H', '2459', '6503', '3569', 'i']

SOLUTION:
s5481T