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]: 3, 7, ['u', '1307', 'F', '8027', 'r', '4559', 'F', 'm', '9805', '5063']
[A]: F9554r7208F


[Q]: 3, 21, ['V', '3661', '3743', 'Y', '3179', 'b', '7097', '3031', '5859', '4095', 'D', 'J', '2337', '4259', '2539', 'I', '9659', 'U', 'G', 'Q', '3145', '177', '9839', 'f']
[A]: 5413QGU9569I935295247332JD5904958513037907b9713Y3473


[Q]: 1, 14, ['F', '7965', 'X', 'H', '9429', '9173', '6357', 'U', '2909', '6677', '963', '6851', 'T', 'R', 'M']
[A]:
RT158636977669092U753637199249HX5697F