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: 2, 3, ['U', 'U', '5201', '4581', '2943', 'B', 'j']

SOLUTION: 1025U

PROBLEM: 9, 19, ['5843', 'b', '161', 'Z', 'h', '2323', '25', 'S', 'Z', 'A', 'l', 'R', 'O', '4543', 'd', 'J', '1667', 'I', 'N', 'K', 'T', '2767', '4409', 'B']

SOLUTION: NI7661Jd3454ORlAZ

PROBLEM: 2, 8, ['5047', '4899', 'K', '6751', '2753', '3333', 'N', 'g', '1529', '401', 'h', 'A']

SOLUTION:
gN333335721576K9984