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: 18, 23, ['1833', 'M', '3301', '6669', 'K', '7747', 'c', 's', 'd', '6435', 'x', 'Y', '2879', 'R', 'Q', 'R', 'O', 'M', 's', 'd', 'y', '5379', '647', 's', '6155', 'k']

SOLUTION: 7469735ydsM

PROBLEM: 2, 3, ['5191', '9077', 'a']

SOLUTION: a7709

PROBLEM: 11, 13, ['8659', 'L', 'k', 'D', '7427', 's', 'C', 'h', 'k', '2195', 's', 'D', '5167', 'S', 'k', 't', '8639', '529', 'z']

SOLUTION:
7615Ds