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, 4, ['339', '1345', '9749', '6877', 'b', 'K', 'f', '1443']

Answer: 7786


Question: 3, 15, ['O', 'a', '6377', 'R', '1363', '8013', '1923', '4039', 'j', '1365', 'E', 'P', '7225', '7813', 'I']

Answer: I31875227PE5631j9304329131083631R7736


Question: 1, 21, ['O', 'R', '1637', 'P', 'h', 'w', 'x', 'i', '7521', '7201', 'j', '1995', '2407', 'o', '5895', '1835', 'a', 'L', '4257', '6667', 'M', 't', 'V', '7443', '1015', 'Q', '7249', '5521', 'w', '5267']

Answer:
M76667524La53815985o70425991j10271257ixwhP7361RO