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, 12, ['f', '8665', '6205', 'L', 'y', 'P', '9351', 'k', '1387', '657', 's', 'k']
[A]: ks7567831k1539PyL50265668f


[Q]: 4, 16, ['S', '5719', '173', 'P', 'a', '5791', 'e', '6279', 'q', '2585', '9533', 'r', '849', 'h', '3259', '3707', '4939', 'X', 'e']
[A]: 70739523h948r33595852q9726e1975aP


[Q]: 6, 15, ['7089', '2133', 'U', '9711', 'x', 'a', '2603', 'm', 'w', '6447', '9719', 'v', '2499', '8771', '1493', 'O', '2861', 'O', '8541', 's']
[A]:
394117789942v91797446wm3062a