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: 3, 14, ['R', 'S', '8031', '5461', 'g', '3405', '2185', '7737', '8757', 'A', 'e', 'C', 'r', '7035', '4573', 'i', 'z', 'I', 'x', 'P', '7753', '107', 'l', 'Q', '6223', 'B', '1721']

SOLUTION: 5307rCeA7578737758125043g16451308

PROBLEM: 3, 3, ['6041', '1503', 'z', '6947', 'W', '3563', '6477', 'h', '8977', 'e', 'z', '5605', '3595', '9327', 'M', 'l', 'j', 'P', 'D', 'h', 'S', 'Q', 'o', '2539', 'a', 'J', 'd', 'k']

SOLUTION: z

PROBLEM: 16, 18, ['o', 'w', 's', '3519', '7825', 'b', '8311', '4739', '1385', 'R', '1443', 'u', '2139', 't', '673', '1835', '1283', '2111']

SOLUTION:
111238215381