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: 3, 6, ['95', '1973', 'L', '8811', '2655', '2661', 'v', 'a', '1115', '7687', '8807', 'r']

Answer: 166255621188L


Question: 6, 7, ['753', '4657', 'h', '13', '593', 'I', '7689', '717']

Answer: 9867I


Question: 3, 19, ['B', '6147', '7285', '3721', 'U', 'G', 'r', '4995', 'R', '7315', '5317', 'I', 'z', 'I', 'm', '5085', 'Q', 'Y', 'f', 'R', '1447', 's', '7873']

Answer:
fYQ5805mIzI71355137R5994rGU12735827