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: 9, 21, ['D', 'j', 'T', '91', 'W', '9709', 'H', '1023', '4595', '1241', '917', '383', '7739', 'G', 'I', 'b', '8401', '7941', 'j', '2713', 'K', '2443', 'E', 'B', '1515', '5141', '1221', '993']

SOLUTION: K3172j14971048bIG937738371914215954

PROBLEM: 7, 17, ['j', '4189', 'N', 'y', 'K', '411', '7999', '8761', '3647', '2651', '805', 'e', 'K', 't', '2753', 'G', '9047']

SOLUTION: 7409G3572tKe5081562746316789997

PROBLEM: 9, 14, ['2505', 'h', 'y', '8797', 'G', 'x', '2377', '7153', 'B', 'k', 'g', '6683', 'X', '9037', '8649', 'V', 'r', '3087', '7139', '7871', 'F', '1453', '6731', 'h', 'z']

SOLUTION:
7309X3866gkB