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: 6, 8, ['J', '4955', '3497', '8869', 'n', '2093', '6249', 'A', '8957']

SOLUTION: A94263902

PROBLEM: 18, 18, ['Z', 'w', '4525', 'E', 'x', '2541', '6953', '7899', '483', 'H', 's', 'M', 'c', 'Y', 'X', '2295', '4587', '2621', '4835', '1375', 'v', '9207', '3165']

SOLUTION: 1262

PROBLEM: 15, 16, ['4339', '5397', '4993', '4555', '9951', '6877', 'E', 'G', 'O', '3587', 'n', '9553', '7773', 'e', 'F', 'U', '5463', 'b', '7759', 'M', 'I', 'X', 'G', 'B']

SOLUTION:
UF

