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: 4, 12, ['I', 'G', 'u', 'S', '9615', 't', 'p', 'P', 'R', 'v', '8819', '5379', 'I', '1165', '4545', '3117', '1577', 'y', 'W', 'R', 'O']

Answer: 97359188vRPpt5169S


Question: 2, 2, ['799', '3533', '7841']

Answer: 3353


Question: 21, 28, ['8365', 'U', 'q', 'b', 'H', 'L', '6117', 'y', '329', '6609', '2723', 'C', '9319', '8627', '2805', 'S', '6267', '7491', 'K', '8739', 'V', '5837', 'f', '3325', 'H', 'e', '8659', '2771', '4855']

Answer:
17729568eH5233f7385V