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? If you are still confused, see the following example:
1, 3, ['238', 'h', '92', 'U', '2799']
Solution: 29h832
Reason: Here, concatenating all the elements between the 1st element and 3rd element and then reversing the string gives '29h832'.

Now, solve this instance: 11, 13, ['5919', 'Y', 'd', 'R', '357', '3547', '6205', '6391', '6769', 'I', '1823', 'c', '5691', '7387', 's', '2067', '5835', '4801', '6335', '7839', '4687', 'k', '2457', 'L', 'O', '9919', '5539', '7339', 't']
Student:
1965c3281