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.

Ex Input:
4, 12, ['H', 'r', 'n', 'Y', '173', '9285', '3105', '883', 'n', '8915', '6923', 'S', 'T', 'o', '1639', '8421', 'g']

Ex Output:
S32965198n38850135829371Y


Ex Input:
4, 9, ['2731', '4987', '2927', '8573', 'O', '8349', '9507', 'K', '7307', 'V']

Ex Output:
7037K70599438O3758


Ex Input:
9, 18, ['m', 'm', '9221', 'b', '6001', 'p', '9031', 'j', '1363', 't', 'b', '8273', 'Q', '659', 'z', 'P', '367', '3529', '2719', 'f', '8177', '7597', 'B', '7525', 'D']

Ex Output:

9253763Pz956Q3728bt3631