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, 2, ['3909', '5863', '707']

Ex Output:
36859093


Ex Input:
2, 2, ['6099', 'r']

Ex Output:
r


Ex Input:
4, 8, ['U', 'f', 'X', 'f', 'Y', 'g', 'j', 'B', 'U', '7991', '2921', '3181', '2763', '8207', '7239', 'y', '663', '8369', 'A', '2931', '8287', '2205']

Ex Output:

BjgYf