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, 15, ['O', 'a', '6377', 'R', '1363', '8013', '1923', '4039', 'j', '1365', 'E', 'P', '7225', '7813', 'I']

SOLUTION: I31875227PE5631j9304329131083631R7736

PROBLEM: 14, 16, ['3661', '8985', 'X', '193', '3329', 'B', '843', 'r', '8273', '9019', '5771', '7523', 'U', 'i', '2029', '4953', '3071', 'Z']

SOLUTION: 35949202i

PROBLEM: 1, 14, ['309', 'U', '8269', 'j', 's', 'P', 'g', '2493', 'H', 'U', 'O', '1663', '5143', '225', '3073', '1857', '8447', '7629', 'f', 'g', '8089', 'l', 'z', 'e', 'g', 'w', 'L', '1199']

SOLUTION:
52234153661OUH3942gPsj9628U903