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:
3, 7, ['P', 'P', 'H', 'r', '3563', 'n', 'M', '1577', '6453']

Ex Output:
Mn3653rH


Ex Input:
3, 10, ['g', '5155', 'p', '6627', 'W', 'q', '2851', 'm', 's', '7781', 'u', '9739']

Ex Output:
1877sm1582qW7266p


Ex Input:
8, 13, ['1493', '2157', 's', 'n', '5935', '3331', '2419', 'z', '5255', 'o', '8215', 'R', '3719']

Ex Output:

9173R5128o5525z