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: 2, 7, ['9969', 'u', '9811', 't', 'z', '8347', 'i', 'O', '5897']

Answer: i7438zt1189u


Question: 15, 16, ['4531', 'a', 'I', 'W', '1071', '1301', 'v', 's', '3521', '7203', '1157', 'w', '7201', 'a', 'I', 'z', 'V', 'X', 'j']

Answer: zI


Question: 15, 16, ['4339', '5397', '4993', '4555', '9951', '6877', 'E', 'G', 'O', '3587', 'n', '9553', '7773', 'e', 'F', 'U', '5463', 'b', '7759', 'M', 'I', 'X', 'G', 'B']

Answer:
UF