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: 5, 11, ['4381', '7607', '3995', '7639', 'W', '2377', '2639', 'Z', 'D', '4511', 'K', '3211', '6939', 'n', 'J', 'd', '9647']

Answer: K1154DZ93627732W


Question: 2, 15, ['l', '8113', '5017', '1077', '5891', 'W', '9723', 'k', '2267', '4153', '1897', 'G', '9173', '5765', '1621', 'Y', 'w', 'A']

Answer:
126156753719G798135147622k3279W1985770171053118