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: 12, 13, ['w', '2825', '7553', '5565', '4973', '1763', '4755', 'c', 'y', '6241', '7527', '7701', '865']

SOLUTION: 5681077

PROBLEM: 7, 14, ['j', '2199', '6995', 't', 'U', 'C', '1589', '7061', '851', 'N', '7923', '7387', '2053', 'L', 'y', '3685', 'X', 'C', '4679', '3691', '2991', 'f']

SOLUTION: L350278373297N15816079851

PROBLEM: 8, 26, ['H', 't', 'H', '6037', 'c', 'V', 'n', '9205', 'd', '5463', 'Z', '4531', '8591', '339', '9515', '7219', 'K', '437', '8563', 'E', 'E', '537', '8169', '6977', '3433', '5633', '849', '7553', '5345', 'O']

SOLUTION:
3365334377969618735EE3658734K9127515993319581354Z3645d5029