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: 21, 24, ['t', '1315', '1977', '8701', 'w', '2899', '9389', 'c', 'F', '2949', '9591', 'Y', '3127', '5887', 'D', '6527', 'I', '3229', '6585', '5375', '6289', 'j', '1775', 'n', 'O', '4741']

SOLUTION: n5771j9826

PROBLEM: 6, 19, ['5701', '5045', '6443', 'N', 'm', '3577', 'B', 'X', 'F', '7309', '3013', 'q', '8183', 'S', '3781', 'g', 'r', 'Z', '8147', 'M', '5275', '851', '7985', '5247', 'J', '5427']

SOLUTION: 7418Zrg1873S3818q31039037FXB7753

PROBLEM: 6, 11, ['R', '7577', '9451', 'S', 'e', '5571', '1715', 'x', '8217', 'f', '7131']

SOLUTION:
1317f7128x51711755