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, ['Q', '6249', 'm', 'H', 'x', 'b', 'Z', 'z', '15']

Ex Output:
9426Q


Ex Input:
7, 8, ['9287', 'V', 't', 'W', 'W', 'w', 'N', 'T', 'Y']

Ex Output:
TN


Ex Input:
4, 7, ['7187', 'M', 'J', '3491', 'v', 'D', '6751', 'c', 'a', '9383', 'g']

Ex Output:

1576Dv1943