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.

9, 19, ['5843', 'b', '161', 'Z', 'h', '2323', '25', 'S', 'Z', 'A', 'l', 'R', 'O', '4543', 'd', 'J', '1667', 'I', 'N', 'K', 'T', '2767', '4409', 'B']
NI7661Jd3454ORlAZ

2, 7, ['9969', 'u', '9811', 't', 'z', '8347', 'i', 'O', '5897']
i7438zt1189u

11, 12, ['c', '421', 'X', '3371', 'N', 'u', '1915', '3215', '2133', '6105', 's', 'j', 'N', '8941', '3109', '1823', '8125', '3507', 'C', 'w']

js