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.

3, 10, ['g', '5155', 'p', '6627', 'W', 'q', '2851', 'm', 's', '7781', 'u', '9739']
1877sm1582qW7266p

6, 6, ['9431', '6731', 'A', '5153', 'K', '1567', 'D', 'Y', 'a', 'q', 'x']
7651

12, 23, ['3349', '5523', '745', 'b', 'E', '3785', '9235', 'b', '9205', '2317', 'C', 'c', 'A', '1209', '9449', '4989', '7671', 'G', '5773', 'N', '6597', 'z', '4449', '4407', '8179']

9444z7956N3775G1767989494499021Ac