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:
3, 5, ['2849', 'J', 'L', '2347', '7219', 'a', 'Q', 'U', '6865', 'O']
answer:
91277432L


question:
3, 4, ['3097', 'E', '4255', '1665', '7179']
answer:
56615524


question:
1, 9, ['7939', '8939', 'K', '7379', '123', 'l', '2357', '6489', 'e', 'D', '9219', 'n', 's', '3953', 'X', '1487', '827', '6699', 'Q']
answer:

e98467532l3219737K93989397