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:
3, 8, ['s', '8395', '7689', 'x', 'P', '5953', 'X', 'D']
answer:
DX3595Px9867


question:
2, 14, ['E', '6397', '2341', '9129', 'o', '317', '695', 'F', 'l', 'd', '9085', 'D', 'F', '8523', 'Z', 'y', '669', 'R', '5841']
answer:

3258FD5809dlF596713o921914327936