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.

Q: 2, 2, ['6099', 'r']

A: r
****
Q: 2, 2, ['8679', 'G', '1819']

A: G
****
Q: 3, 20, ['T', '5045', '2161', '5711', 'm', 'l', 'c', 'k', '7181', 's', '8253', '2911', 'r', 'w', 'l', '5973', '7939', 'w', 'p', 'x']

A:
xpw93973795lwr11923528s1817kclm11751612
****