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


question:
2, 2, ['w', 'e']
answer:
e


question:
1, 8, ['8719', '6925', '7031', '4217', '8323', '1929', 'm', 'u', '9083']
answer:

um929132387124130752969178