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, 3, ['o', 'o', '4511', '9203', '6071', 'Q', '5337']

Ex Output:
1154oo


Ex Input:
4, 4, ['339', '1345', '9749', '6877', 'b', 'K', 'f', '1443']

Ex Output:
7786


Ex Input:
2, 2, ['h', 'F']

Ex Output:

F