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, 6, ['6843', '7805', 'h', '9097', 'O', 'u']
uO7909h

1, 3, ['7635', 'c', 'h', 'D', 'K', '7235', 'e']
hc5367

1, 6, ['2079', '3383', 'q', '7651', 'B', 'H']

HB1567q38339702