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: 1, 3, ['F', 'R', 'v', 'X', '7135', 'V', '8597', '5153', 'T', '4513', 'B', '7089', 'Q', '3621', 'o', 'W', '4555', '9307', '9997', 'I', '1029', 'c', '363', 'G']

SOLUTION: vRF

PROBLEM: 1, 4, ['6193', '5871', '9871', '4821']

SOLUTION: 1284178917853916

PROBLEM: 10, 23, ['8189', '641', '9165', 'L', 'R', 'N', 'q', 'k', '7301', '5039', 'd', 'X', 'P', 'p', 'p', '6913', '7481', 'M', '1403', 'W', '3985', '1761', 'F', 'l', '2233']

SOLUTION:
F16715893W3041M18473196ppPXd9305