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, 12, ['9797', 'D', '41', 'Y', 's', 'u', 'X', 'Q', '2437', '7385', '7137', 'S', '6367', 'w', 'f', '7021', '7685', '7413']

SOLUTION: S731758377342QXusY14D

PROBLEM: 14, 15, ['3351', '8899', 'M', 'm', '2939', 'e', '1681', '9189', 'b', 'j', 'L', '1927', '2855', '2993', 'F', 'P', '3261', '3185', 'U', '8887', 'M', '9865']

SOLUTION: F3992

PROBLEM: 4, 5, ['1215', '4313', 'Q', 'x', '9431', '6357', 'S', '2593', 'R', 'y', 'n', '3907', 'v']

SOLUTION:
1349x