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, 6, ['e', 'w', '503', '2677', '4099', 'F', '4781', '3995', '8221', 'z', '6689', 'L', '3821', 'b', 'A', 'P', '4037', 'v', 'M', '3919']

Ex Output:
F99047762305


Ex Input:
27, 28, ['k', '2839', 'e', 'j', 'A', '5649', 'N', '2829', 'u', '6889', '9691', '6695', '9849', '8171', 'a', 'D', '1887', 'Q', 'P', 'H', 'n', '6333', '1491', 'U', '5313', 'A', '699', '665', 'N', 'q']

Ex Output:
566996


Ex Input:
15, 20, ['7183', 'Y', '3535', '9939', '4973', 'E', '939', 'h', 'M', 's', '8557', 'C', '4687', 'M', '6739', 'B', 's', '7471', 'F', 'Q', 'I', '2961', '4699', '2497', '9923', 'M', '2165', 'x', '6349', '1821']

Ex Output:

QF1747sB9376