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, 19, ['5701', '5045', '6443', 'N', 'm', '3577', 'B', 'X', 'F', '7309', '3013', 'q', '8183', 'S', '3781', 'g', 'r', 'Z', '8147', 'M', '5275', '851', '7985', '5247', 'J', '5427']
answer:
7418Zrg1873S3818q31039037FXB7753


question:
1, 8, ['7991', '7999', '8575', '4211', '6003', '2483', '7877', '7249', 'K', '21']
answer:
94277787384230061124575899971997


question:
7, 9, ['5123', 'S', 'y', '8829', '9049', 'Y', 'f', 'a', '9609']
answer:

9069af