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: 7, 9, ['w', 'L', '7649', 's', 'D', '45', 'L', 'O', 'H', '2781', '6883', 'h']

SOLUTION: HOL

PROBLEM: 3, 5, ['w', 'i', 'X', '9493', 'g', 'K', 'h', 'X']

SOLUTION: g3949X

PROBLEM: 8, 15, ['5229', '4553', '3485', 'E', 'M', 'm', 'M', 'B', '8119', '7871', '5661', '2545', '2519', 'b', '5165', 'h', 'L']

SOLUTION:
5615b91525452166517879118B