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:
4, 13, ['6993', '5601', 'n', 'J', 'E', 'M', 'd', 'T', 'V', 'C', '4969', 'J', 'F']
answer:
FJ9694CVTdMEJ


question:
3, 5, ['w', 'i', 'X', '9493', 'g', 'K', 'h', 'X']
answer:
g3949X


question:
21, 27, ['t', 'a', 'X', '8133', '9355', '3823', '7019', '8651', 'n', '7171', 'I', '4201', '4595', '7283', 'Q', 'a', 'E', '1267', 'U', 'R', 'o', '8795', 'N', '1507', '8509', 'E', 'K', '3593', '2139']
answer:

KE90587051N5978o