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: 8, 11, ['8881', '4663', '605', '7367', 'C', '3663', '3729', '7073', '4973', 'n', 'd', 'y', 'B']

SOLUTION: dn37943707

PROBLEM: 2, 4, ['s', '4715', '8867', '5091', '435', 'z', '1765', 'H', '5107', 'F', 'F', 'i', '8923', '3693', 'F', '1211', '3111', '1669', 'm', 'c']

SOLUTION: 190576885174

PROBLEM: 4, 6, ['R', 's', '843', '5245', '3627', '5121', 'i', 'H']

SOLUTION:
121572635425