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.

[Q]: 1, 7, ['4177', 'T', 'Q', '915', '7823', 'm', '6453']
[A]: 3546m3287519QT7714


[Q]: 5, 6, ['q', 'L', 'f', '391', '7601', '2925', 'i', 'C', '4787']
[A]: 52921067


[Q]: 15, 15, ['7451', 'I', 'u', '2899', '475', '2217', 'W', 'J', 'y', 'e', 'E', '8075', '8281', '8271', '5731', '5649', 'q', 's', '77', '3447', '6635']
[A]:
1375