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:
11, 15, ['807', '2753', 'L', '8633', '7203', 'j', 'a', 'r', 'R', 'q', 'g', 'B', 't', '1373', '3371', 'S', '9977', 'y']

Ex Output:
17333731tBg


Ex Input:
1, 9, ['f', 'f', '4381', 'c', '3523', 'u', 'E', 'y', '7713', 'f', 'Q', '7631', '9529', 'M', '6041', '8011', '8441', 'i', 'c', 'V', 'b', 'x', 'h', 't', 'l', '5041', 'v', '6685', 'c']

Ex Output:
3177yEu3253c1834ff


Ex Input:
1, 1, ['9915', 'D', 'a']

Ex Output:

5199