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:
3, 6, ['e', 'w', '503', '2677', '4099', 'F', '4781', '3995', '8221', 'z', '6689', 'L', '3821', 'b', 'A', 'P', '4037', 'v', 'M', '3919']

Ex Output:
F99047762305


Ex Input:
5, 7, ['6005', 'y', '5057', '7865', '2845', '101', 'M', 'd']

Ex Output:
M1015482


Ex Input:
4, 15, ['T', 'S', '9297', '7145', 'v', 'W', '4943', 'G', 'a', 'k', '5515', '3681', '7477', '2393', '1997', 'x', '863', '2735', '6753', '569', 'N', 'T', '2935', '7343', '8735']

Ex Output:

79913932774718635155kaG3494Wv5417