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, 7, ['1247', 's', 'J', 'w', 'X', '7211', 'c']
answer:
c1127Xw


question:
2, 17, ['781', '1949', '8017', 'I', 'F', 'k', 's', 'f', '9531', '3769', '8135', 'R', '7643', 'v', '6217', '4085', 'M', '1993']
answer:
M58047126v3467R531896731359fskFI71089491


question:
17, 23, ['w', 'y', '9441', '7949', '1791', '7749', 'a', 'm', '9013', '8643', '3405', '8171', '725', 'N', 'Y', '4877', 'T', '4681', '7421', '9985', '7169', '6709', '8849']
answer:

948890769617589912471864T