Teacher: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.
Teacher: Now, understand the problem? Solve this instance: 6, 18, ['4635', '3757', 'J', '439', 'R', 'h', 'u', '8749', '1229', '4983', '5165', '141', 'G', '8705', 'v', '5053', '2107', '9143', 'k', '7023', 'W', 'Z', 'e', '4603', '869', '1837', 'P']
Student:
341970123505v5078G1415615389492219478uh