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: 2, 9, ['g', '309', 'x', '3537', '5995', 'K', '6951', 'x', 'b', '3171', '9079', '7597']

SOLUTION: bx1596K59957353x903

PROBLEM: 1, 2, ['4857', '9647']

SOLUTION: 74697584

PROBLEM: 9, 18, ['3241', 'r', '729', '7641', 'L', '979', 'a', '1703', 't', 'Y', '1567', '4879', '7083', '5877', '6695', 'q', '1795', 'Y', 'Q', 'H']

SOLUTION:
Y5971q59667785380797847651Yt