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: 6, 11, ['B', 'j', '911', 'A', '7195', 'm', '7177', 'X', '2015', 't', 'P', 'x', 'F']

Answer: Pt5102X7717m


Question: 4, 4, ['u', 'Z', 'e', '253', '2663', 'q', '8421', '2509', '2831', 'H']

Answer: 352


Question: 6, 7, ['v', '8017', '1101', '3507', '4945', 'L', 'R', '4633', 'q', 'k', '8163']

Answer:
RL