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, 3, ['5819', '3317', '451', '5811']

Answer: 154


Question: 2, 4, ['U', '4013', '3925', '9017', '3425', 'H', '9015', '4053', '8915', '5945', '8979', '2203']

Answer: 710952933104


Question: 2, 7, ['J', '6705', 'X', 'R', 'u', '7427', '2361', 'm', '3831', 'f', 'P', '6241', '1261']

Answer:
16327247uRX5076