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, 2, ['Q', '6249', 'm', 'H', 'x', 'b', 'Z', 'z', '15']

SOLUTION: 9426Q

PROBLEM: 4, 12, ['H', 'r', 'n', 'Y', '173', '9285', '3105', '883', 'n', '8915', '6923', 'S', 'T', 'o', '1639', '8421', 'g']

SOLUTION: S32965198n38850135829371Y

PROBLEM: 3, 3, ['7529', '8729', 'd', '7645', '1129', 'W', 'd', 'a', '6525']

SOLUTION:
d