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:
2, 19, ['C', 'D', 'C', 'Z', '3843', 'j', 'T', 'o', '9147', '2915', 'n', 'N', '939', 'S', '2457', '7789', 's', 'z', 'V']
answer:
Vzs98777542S939Nn51927419oTj3483ZCD


question:
1, 7, ['P', 'h', '1443', 'b', 'K', '2641', '3831']
answer:
13831462Kb3441hP


question:
1, 4, ['z', 'p', '6899', '251', 'f']
answer:

1529986pz