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, 20, ['5263', '7963', '8931', 'I', 'n', '8167', 'A', '5429', 'O', '6539', '7303', 'V', 'l', 'd', 's', '8377', 'Z', '7345', 'X', 'D', '6125', 'c', 'o', 'x', 'I', '2807', '3995', '3297', 'O']

SOLUTION: DX5437

PROBLEM: 1, 4, ['B', '5591', '1237', '1519']

SOLUTION: 915173211955B

PROBLEM: 13, 20, ['8733', '2963', 'n', 'Q', '6487', 'F', '6115', 'e', '8159', '3369', '323', 'A', 'M', 'V', '819', 'H', 'p', '4713', 'X', 'B', 'B']

SOLUTION:
BX3174pH918VM