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, 7, ['1245', '6761', 'w', 'A', '2303', '1045', 'H', '6193', '6147', 'H', 'S', '305', '7895']

SOLUTION: H54013032

PROBLEM: 11, 18, ['W', '5215', 'G', '6229', 'z', 'R', 'e', 'U', '5847', 'L', '1587', '7287', 'a', 'S', '4887', 'B', 'F', 'h', '7409', '8297', 'h', 'N', 'E', '9925', 'B', 'l', '6091', '1345']

SOLUTION: hFB7884Sa78277851

PROBLEM: 5, 7, ['P', '9187', '1193', '6741', '1067', 'X', 'r', 'X']

SOLUTION:
rX7601