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: 10, 17, ['H', '8993', 'l', 'W', 'T', '7135', 'A', '743', '7525', '1361', '9927', '3409', 'g', 'k', 'd', 'w', '7523', '1303']

SOLUTION: 3257wdkg904372991631

PROBLEM: 7, 8, ['U', 't', '8289', '9391', '1751', 'Y', '9319', 'A', 'Q', 'd', 'B', '2521', '2455']

SOLUTION: A9139

PROBLEM: 1, 7, ['4773', 'L', 'v', '1067', 'F', '4013', '2687', '4191', 'c', 'q', '2937', '6051', 'k', 'G', 'r', 'j', 'C', 'W', '5159', '4643', 'K', 'o', 'L', 'v', 'x', 'd', 'T', 'X']

SOLUTION:
78623104F7601vL3774