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, ['6627', 'J']

Ex Output:
J7266


Ex Input:
1, 2, ['k', 'A', '2153']

Ex Output:
Ak


Ex Input:
1, 6, ['B', '4767', '7901', '125', 'v', '8417', 'X', '4815', 'L', '2189']

Ex Output:

7148v52110977674B