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, 5, ['7115', '3109', '3805', '6831', '6897', 'y', 'b']
[A]: 79861386508390135117


[Q]: 3, 20, ['x', 'S', 's', 'a', '5077', 'D', '3979', 'I', '3129', 'R', '8517', 'r', 'l', 'K', 'N', '9701', '227', 'n', '9385', 'U']
[A]: U5839n7221079NKlr7158R9213I9793D7705as


[Q]: 7, 14, ['1115', 'X', '743', '8303', '6589', 'Z', 'A', 'Z', '7425', '6029', 'x', '2641', '7045', '2917']
[A]:
719254071462x92065247ZA