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: 19, 28, ['b', '6837', '3831', 'Z', '6939', '8623', '1133', 'S', 'a', '2263', 'k', '3359', '6779', 'Y', 'R', '2601', 'd', 'd', '7623', '3719', '2373', '9693', '4807', '7067', '1263', '1405', '8047', 'd', 'K']
Student:
d740850413621760770843969373291733267