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: 1, 3, ['8015', 'y', 'r', '8077', 'U']

Answer: ry5108


Question: 19, 20, ['w', '4131', 'C', '719', '2961', 'Q', '4167', '1001', 'p', '965', '1153', '6881', '3361', 'H', 'f', 'V', '9393', 'x', '6091', 'B', '6757', 'U', '2619', '5649', '6447', 'D']

Answer: B1906


Question: 12, 14, ['4271', '9741', 'C', 'B', '8171', 'T', 'w', '9937', 'i', '8447', 'T', '6823', 'P', '4199', '4551', 'E', 'h', '9653', 'f']

Answer:
9914P3286