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.
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Question: 2, 2, ['8679', 'G', '1819']

Answer: G


Question: 1, 2, ['3909', '5863', '707']

Answer: 36859093


Question: 2, 4, ['1279', '2109', '3067', '4517', 'u']

Answer:
715476039012