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:
7, 14, ['j', '2199', '6995', 't', 'U', 'C', '1589', '7061', '851', 'N', '7923', '7387', '2053', 'L', 'y', '3685', 'X', 'C', '4679', '3691', '2991', 'f']
answer:
L350278373297N15816079851


question:
5, 6, ['u', 'O', 'l', '9119', 'P', '6983', 'H', '6701']
answer:
3896P


question:
4, 10, ['7773', '7189', 'h', 'G', '5823', '3951', '4961', 'e', '6967', 'D', 'Q', '8625', '8011', '6635', '951', '4867']
answer:

D7696e169415933285G