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:
6, 13, ['a', 't', '3699', 'H', 'c', 'S', '2713', '5419', 'q', '7877', 'q', 'U', '833', '8411', '2003', '5373', 'P', '2913']
answer:
338Uq7787q91453172S


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


question:
12, 26, ['8423', '995', '1911', 'B', 'e', 'G', '5829', '8389', '1407', 'A', '6371', 'H', '6911', 'R', 'J', 'l', 'S', 'u', '6795', '6935', 'h', '8679', '1005', '5269', 'Q', '8453', 'x']
answer:

3548Q962550019768h53965976uSlJR1196H