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: 3, 20, ['x', 'S', 's', 'a', '5077', 'D', '3979', 'I', '3129', 'R', '8517', 'r', 'l', 'K', 'N', '9701', '227', 'n', '9385', 'U']

SOLUTION: U5839n7221079NKlr7158R9213I9793D7705as

PROBLEM: 2, 24, ['D', 'I', '6457', 'a', '7827', '605', '637', 'l', '7505', 'B', 'C', 's', 't', 'r', '7433', '7831', '707', '5721', 'q', 'V', '5315', 't', 'R', '6985', 'v', '8837', '8729', '3383']

SOLUTION: 5896Rt5135Vq127570713873347rtsCB5057l7365067287a7546I

PROBLEM: 7, 11, ['4825', 't', 'z', 'e', '119', '4373', '8869', 'O', 'k', 'k', '1429', '9327', '6825', '9393', 'Y', 'p', '4275']

SOLUTION:
9241kkO9688