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: 11, 15, ['4565', 'Q', 'C', '8503', 'n', 'B', 'r', '8589', 'h', 'v', 'B', '5755', 'h', '3595', '9739', 'X', 'n', '5393']

SOLUTION: 93795953h5575B

PROBLEM: 3, 13, ['9827', '3335', 'K', 'p', '7941', 'U', '4513', 'l', 'B', '179', '9825', '5437', 'u', '7853', '8907', 't', 'V', 'U', 'K', '7159', '6077', 'n']

SOLUTION: u73455289971Bl3154U1497pK

PROBLEM: 7, 21, ['x', 'w', '3341', 'y', 'q', '5537', '7745', 'W', '1979', 'W', 'D', '8141', 'Y', 'e', '7887', 'Y', '1709', 'Y', '4053', 'Z', '8135', '3321']

SOLUTION:
5318Z3504Y9071Y7887eY1418DW9791W5477