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:
13, 20, ['8627', '7993', 'N', 'p', 'n', 'v', 'T', 'L', 'z', '2929', 'a', 'D', '8465', 'R', '8803', 'q', '1069', 'p', '7231', '9581', '1689', 'b', '8773', 'P', 'a', 'L', 't']
answer:
18591327p9601q3088R5648


question:
7, 10, ['417', '8131', '7239', '9699', 'z', 'H', 'P', '9349', '4835', '3217', '9899']
answer:
712353849439P


question:
9, 17, ['3105', '1113', 'A', '4367', 'm', 'O', '3141', 'a', 'h', '5647', 'c', 'G', '25', '457', 'K', 'Y', 'F', '9867', '3775', 'x', 'R', 'y', '8205', '6527']
answer:

FYK75452Gc7465h