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, 5, ['M', 'H', '7813', '6149', 'u', 't', '3643', '5901', 'A', 'g', '3929', 'V']

Ex Output:
u94163187HM


Ex Input:
4, 7, ['1247', 's', 'J', 'w', 'X', '7211', 'c']

Ex Output:
c1127Xw


Ex Input:
2, 2, ['7923', 'Q', '6529']

Ex Output:

Q