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, 6, ['p', 'H', '2775', '2567', '7787', 'D', '3807', '4817', '5399']

SOLUTION: D787776525772

PROBLEM: 2, 17, ['4379', 'I', '2897', 't', 'H', 'W', 'z', 'i', 'f', 'b', '2901', '9357', 'c', 'Y', 'R', '2757', 'J', '9265', 'I', 's', 'j', '2617', 'q', 'a']

SOLUTION: J7572RYc75391092bfizWHt7982I

PROBLEM: 2, 26, ['3157', 'L', 'O', '6587', 'Q', '8023', '1995', '2377', '1167', '1781', '3707', '8411', '5041', 'R', 'd', '389', 'W', '7891', '1585', 'r', 'n', '9435', '2315', 'O', 'w', '6751', 'x', 'b']

SOLUTION:
1576wO51325349nr58511987W983dR14051148707318717611773259913208Q7856OL