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: 6, 8, ['4263', '4799', 'D', '4627', 'P', 'z', '8589', '5107', 'T', 'R', 'L', 'G', 'd']

SOLUTION: 70159858z

PROBLEM: 3, 3, ['5819', '3317', '451', '5811']

SOLUTION: 154

PROBLEM: 16, 18, ['f', 'm', '6405', 'Q', 'l', 'Z', 'L', 'a', '2755', '2937', '9385', 'u', 'C', '3975', '1423', 'd', 'D', 'x', 'Y', 'O', 'J', 'r', '2775', 'F', 'O', 'n', 'M']

SOLUTION:
xDd