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:
1, 7, ['P', 'h', '1443', 'b', 'K', '2641', '3831']

Ex Output:
13831462Kb3441hP


Ex Input:
3, 5, ['2849', 'J', 'L', '2347', '7219', 'a', 'Q', 'U', '6865', 'O']

Ex Output:
91277432L


Ex Input:
11, 12, ['q', 'u', 'F', '81', '7215', '4099', 'z', 'R', '1399', '5223', '1281', '1877', 'Q']

Ex Output:

77811821