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:
4, 20, ['p', '1643', 'O', '5867', 'Y', 'j', '2411', 'Z', '2563', '4757', 'B', 'b', '7489', '815', 'c', '6631', '8571', '6537', 'm', 'T']
answer:
Tm735617581366c5189847bB75743652Z1142jY7685


question:
7, 8, ['U', 't', '8289', '9391', '1751', 'Y', '9319', 'A', 'Q', 'd', 'B', '2521', '2455']
answer:
A9139


question:
8, 9, ['Y', 'a', '7409', '4053', 'H', 'R', '7573', '4713', '7235', 's', 'B', '2491']
answer:

53273174