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: 8, 21, ['9651', 'f', '8321', 'f', 'c', '6891', '6805', '4869', 'z', '7867', 'M', '4437', '4051', '1453', '3577', 'p', '7393', 'E', '5609', '8231', 'o', '3853', 'U', '3131', 'P', 'P', '1009', '5897', 'l', '9097']
Student:
o13289065E3937p7753354115047344M7687z9684