instruction:
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.
question:
3, 13, ['9827', '3335', 'K', 'p', '7941', 'U', '4513', 'l', 'B', '179', '9825', '5437', 'u', '7853', '8907', 't', 'V', 'U', 'K', '7159', '6077', 'n']
answer:
u73455289971Bl3154U1497pK


question:
10, 19, ['V', '2245', '8933', '3669', '7723', 'v', '1895', 'w', 'N', 'g', '3075', 'k', '813', '3569', 'i', 'j', '4087', 'M', '4019', 'n', 'E', 'p']
answer:
9104M7804ji9653318k5703g


question:
6, 15, ['q', '4777', '8995', '9093', '5175', '6787', '7485', '777', '4989', 'Q', 'z', '95', '6139', '7785', '3567', 'S', '6247', 'S']
answer:

76535877931659zQ989477758477876