instruction:
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:
3, 4, ['2419', '643', '8177', '7291', '561', '6529', '4101', 'u', '6445']
answer:
19277718


question:
3, 3, ['H', '7843', '2823', '529']
answer:
3282


question:
7, 9, ['4593', '8763', 'e', 'y', 'X', '6371', 'b', '8703', 'w', '9691', 'G']
answer:

w3078b