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, 2, ['G', 'S']

SOLUTION: S

PROBLEM: 9, 10, ['l', '9027', 'D', 'T', '6001', '7127', '2551', '3093', 'i', '3453']

SOLUTION: 3543i

PROBLEM: 8, 13, ['4995', 't', 'a', '9509', 'p', '8233', 'E', '805', '875', '7887', '8695', '8219', 'Q', 'f']

SOLUTION:
Q912859687887578508