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:
1, 2, ['e', 'F']

Ex Output:
Fe


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

Ex Output:
32435357H5824o959757159711149PR


Ex Input:
1, 12, ['O', '4401', 'j', 'u', '3207', 'y', 'D', '1751', '7107', 'Y', '3769', 'U', '5495']

Ex Output:

U9673Y70171571Dy7023uj1044O