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:
18, 23, ['1833', 'M', '3301', '6669', 'K', '7747', 'c', 's', 'd', '6435', 'x', 'Y', '2879', 'R', 'Q', 'R', 'O', 'M', 's', 'd', 'y', '5379', '647', 's', '6155', 'k']

Ex Output:
7469735ydsM


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

Ex Output:

7037K70599438O3758