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, 5, ['j', '239', '9689', 's', 'C', 'w']

Ex Output:
Cs9869


Ex Input:
5, 6, ['7565', '6525', '7421', 'u', '303', '1815', '273', '6725', 'i']

Ex Output:
5181303


Ex Input:
14, 17, ['b', '7631', '2271', '3565', '3615', 'F', 'W', 'I', '8853', '8327', '2889', 'd', 't', '1397', '471', '9921', '8139', 'v', 's', 'V', '7991', 'Q', 'X']

Ex Output:

931812991747931