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:
5, 7, ['B', '7943', 'H', 'E', 'p', 'D', 'L', '625', '2757', '4429', '863', 'z', 'l', 'f', '3467', 'X', '4961', 'T', 'k', '1021', 'T', '2249', 'S', 'D']

Ex Output:
LDp


Ex Input:
2, 12, ['W', 'R', 'P', '9411', '179', '5175', '7959', 'o', '4285', 'H', '7535', '3423', 'Q', '7813', '611']

Ex Output:
32435357H5824o959757159711149PR


Ex Input:
8, 20, ['q', 'D', 'F', 'O', 'M', 'C', '8917', '3865', '1961', '445', '2975', '7133', '1783', '6769', '847', 'h', '9621', 'U', 'c', 'v', '7757', 'E']

Ex Output:

vcU1269h748967638713317579254416915683