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


question:
1, 5, ['d', 'p', 'B', 'i', '5865', '4569']
answer:
5685iBpd


question:
3, 10, ['v', '507', '5625', '6047', '9941', '9897', '67', 'W', '5759', 'I', 'm', 'E', 'u', 'h', '2043', '5051', 'f', 'V', '1745', 'd', 'G']
answer:

I9575W767989149974065265