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: 4, 5, ['1803', 'T', 'u', '1089', '5655']

SOLUTION: 55659801

PROBLEM: 2, 5, ['1987', '3507', '839', '3509', '9857', 'V', '9987', 'g', 'G', '7295', 'v', 'b', 'o', 'Q', 'Q', 'x', '3295', '9917', 'R', '221']

SOLUTION: 758990539387053

PROBLEM: 13, 16, ['r', 'R', 'J', 'M', '2255', 'Z', 'h', '4437', '5565', '3067', '1783', 'E', '2389', '9669', 'K', 's']

SOLUTION:
sK96699832