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.

Example Input: 6, 7, ['E', 'A', 'd', 'a', 'S', '851', '8465', '3205', '5169', '7097', '1679', '3875', 'B', '4761']
Example Output: 5648158

Example Input: 1, 3, ['4101', '9767', 'q', 'Z', '6853', '3643']
Example Output: q76791014

Example Input: 21, 22, ['A', '8941', '5023', '7251', '4391', 'r', 'H', '3795', 'B', '4261', 'c', 'Z', '2739', 'M', '145', '3899', 'S', '7947', 'Q', 'h', 'u', '4599', '8469', 's', '8577', 'r']
Example Output:
9954u