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.

[Q]: 6, 13, ['a', 't', '3699', 'H', 'c', 'S', '2713', '5419', 'q', '7877', 'q', 'U', '833', '8411', '2003', '5373', 'P', '2913']
[A]: 338Uq7787q91453172S


[Q]: 3, 4, ['E', 'k', '4697', 'f', 'J', 's', '1265', '4673', 'D', '3345', 'n', '5593', '2249', '5951']
[A]: f7964


[Q]: 16, 19, ['R', 'H', '1143', 'T', '2299', '713', 'b', 'b', '2605', '8881', '7553', '9057', 's', 'f', 'o', '4361', '3941', 'F', '2415', 'm', '8007', 'F', '1155', 'n', 'O', 'p']
[A]:
5142F14931634