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, 5, ['l', 'E', '729', 'U', 'z', '9729', '3247']

Answer: zU927E


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

Answer: 7786


Question: 7, 22, ['5803', 'F', '775', 'N', 'b', '8039', '7761', 'v', '3747', 'b', '5355', 'o', '311', '893', 'v', '1535', 'g', 'B', 'a', 'f', '567', 't', 'L', '6809', '6659', 'H', 'i', '2201', 'I', '4225']

Answer:
t765faBg5351v398113o5535b7473v1677