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.

2, 4, ['o', '5393', 'p', 'h', '5617', 'F', 'I', 'a']
hp3935

3, 5, ['C', '4345', 'T', 't', 'U', 'p']
UtT

18, 21, ['6403', 'i', 'q', '3033', 'I', 'q', '4327', 'Y', 'w', 'R', '6193', '119', '3717', '813', '2831', '2801', '703', 'w', '3517', '1265', '9409', '7607', '8665', 'M', '9919', '5203', '1967', 'v']

904956217153w