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

SOLUTION: g3949X

PROBLEM: 3, 5, ['C', '4345', 'T', 't', 'U', 'p']

SOLUTION: UtT

PROBLEM: 2, 9, ['47', '9357', '6839', 'D', 'h', 'e', '877', 'U', '3279']

SOLUTION:
9723U778ehD93867539

