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, 16, ['O', 'x', 'E', 'z', 'q', '2235', 'j', 'Q', '9655', '6887', '7651', '4695', 'p', 'M', '7975', 'p', 'u', '7275', 'y', 'w', '9677', 'I', '8609', '3333', '1835', '7137', '2509', '6157', '1805']

Ex Output:
p5797Mp5964156778865569Qj5322qz


Ex Input:
1, 1, ['Q', '2357', '6479', '7105', 'M', 'x', '6281', '9331', 'z', 't', 'N', 'O', 'n', 'K', '9575', 'w', '657', '8531', '8837', 'p', '7781']

Ex Output:
Q


Ex Input:
3, 7, ['z', '6293', '589', 'f', '1285', '9995', '6393', '1617', '2847']

Ex Output:

393659995821f985