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: 3, 20, ['x', 'S', 's', 'a', '5077', 'D', '3979', 'I', '3129', 'R', '8517', 'r', 'l', 'K', 'N', '9701', '227', 'n', '9385', 'U']

Answer: U5839n7221079NKlr7158R9213I9793D7705as


Question: 13, 16, ['a', 'y', 'd', 'F', 'P', '8965', 'G', 'V', 'W', 'y', '4275', '7653', '5643', '321', 'u', '721', 'm', '1483', '3321', '3851', '6373', '9445', '1193']

Answer: 127u1233465


Question: 4, 7, ['3037', 'L', '8259', 'm', 'I', 'G', '9667', 'O', '1669', '3625', 'T', 'p', 'U', '4893', 'B', 'x', 'L', 'x', 'q', 'x', 'v', '8129', 'y', 'r']

Answer:
7669GIm