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:
4, 5, ['3001', '661', 'S', 'N', '7919']

Ex Output:
9197N


Ex Input:
4, 19, ['I', 'h', 'D', 'd', 'e', 'X', 'h', '2821', 'y', '2537', '2345', 't', 'I', 'i', 'D', '543', '2469', 'j', 'V', 'U', '8523', '605', 'J', '6675', '8559', 'n']

Ex Output:
Vj9642345DiIt54327352y1282hXed


Ex Input:
7, 20, ['79', 'o', 'V', '9503', 'd', '3305', 'b', '2821', '8801', 'L', '6237', 'C', 'C', '895', '6589', '3935', 'X', 'q', 'b', '3991', '805']

Ex Output:

1993bqX53939856598CC7326L10881282b