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.
--------
Question: 1, 5, ['7115', '3109', '3805', '6831', '6897', 'y', 'b']

Answer: 79861386508390135117


Question: 1, 5, ['3155', '5437', '1383', 'L', 'a']

Answer: aL383173455513


Question: 1, 3, ['3619', 'b', 'm', 'Y', 'n', '9557', '4649']

Answer:
mb9163