You will be given a definition of a task first, then some input of the task.
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.

4, 10, ['9415', '5997', '1209', 'q', 'W', '6721', '6537', '7073', '5435', 'C', '8399', '2109', '7443', 'w', '9931', 'T', '6433', 'I', 'u', '6879', '8799', '1749', '2107']
Output:
C5345370773561276Wq