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.

[EX Q]: 1, 1, ['Q', '2357', '6479', '7105', 'M', 'x', '6281', '9331', 'z', 't', 'N', 'O', 'n', 'K', '9575', 'w', '657', '8531', '8837', 'p', '7781']
[EX A]: Q

[EX Q]: 5, 5, ['4733', 'G', '9275', '7757', 'I', 'v', 'z', 'p', 'Z']
[EX A]: I

[EX Q]: 1, 19, ['k', '7677', '9169', '5761', 'h', 'B', 'm', '2437', '6925', 'w', 'y', '665', 'H', 'v', 'q', '3515', '2637', '791', '4729', '3029', 'Y', '9869', '8655']
[EX A]:
927419773625153qvH566yw52967342mBh167596197767k