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.

13, 18, ['1931', '2101', 'U', '3395', '7549', '5187', '4669', '9151', '6971', '5793', '2173', '2279', 'h', 'w', 't', '4769', '6581', 'D']
D18569674twh

2, 3, ['N', 'U', 'D', 'm', '9001', 'I', '2675', 'l', '2771', 'U', '1181', 'U']
DU

1, 5, ['2401', 'r', 'b', '6129', 'L', '1079', 'w', '5735']

L9216br1042