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: 13, 18, ['1931', '2101', 'U', '3395', '7549', '5187', '4669', '9151', '6971', '5793', '2173', '2279', 'h', 'w', 't', '4769', '6581', 'D']

SOLUTION: D18569674twh

PROBLEM: 6, 8, ['u', 'y', '5599', 'i', 'Z', 'F', '8907', 'A', 'l', '8821', 'B', 'G', 'd']

SOLUTION: A7098F

PROBLEM: 1, 5, ['s', '4625', 'U', '8033', '4349', '1387', 'G', 'p', 'B', '1323', '4669', '533', '5869', 'x', '7305', '4887', '345', 'b', 'A', '6627', 'Z', '6941', '2569', 'h']

SOLUTION:
94343308U5264s