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: 17, 21, ['5503', '2979', '6307', '633', 'n', '9339', '5829', '5291', '8967', 'i', '9063', '975', 'G', '9187', '3227', 'A', '3487', '8187', 'H', '6097', 'H']

A: H7906H78187843
****
Q: 3, 3, ['x', 'v', 'p', '4337', '635', '8927', 'B']

A: p
****
Q: 8, 18, ['4585', 'D', 'N', '879', '1181', '8219', '1079', 'Y', 't', 'U', 'M', '4241', 'X', '8449', 'T', 't', 'e', '8993', 'p', 'E', '321']

A:
3998etT9448X1424MUtY
****