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, 7, ['P', 'P', 'H', 'r', '3563', 'n', 'M', '1577', '6453']

Ex Output:
Mn3653rH


Ex Input:
16, 18, ['7121', 'b', 'P', '7771', 'l', 'I', '7817', '5185', '7989', 'H', '4449', '3859', '869', '9321', 'O', '6453', '6219', '8349', '5327', 'm', 'c', 'O', '1185', '2703', '9673', 'q']

Ex Output:
943891263546


Ex Input:
11, 16, ['7583', '441', '4763', '2787', '4293', '5467', '319', '2169', 'b', 'n', 'B', '5093', '8583', 'g', '6339', '4581', 'a', 'T', 'i', '5999', '3995', '7903', 'E']

Ex Output:

18549336g38583905B