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: 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: 22, 23, ['9853', '3839', '2279', 'o', 'Y', '6513', '4505', '1861', 'm', '8009', 'i', '8855', '6777', '3055', '4055', '3903', '5639', 'y', '579', '7271', '8021', 'R', '4547', '1439', '29', '1611', 't', '6279']

SOLUTION: 7454R

PROBLEM: 3, 3, ['J', 'F', '6845', 'z']

SOLUTION:
5486