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]: 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']
[EX A]: 5413QGU9569I935295247332JD5904958513037907b9713Y3473

[EX Q]: 1, 7, ['4177', 'T', 'Q', '915', '7823', 'm', '6453']
[EX A]: 3546m3287519QT7714

[EX Q]: 10, 17, ['z', '8353', 'r', '3573', 'T', '4845', 'n', 'u', 'e', '9603', '307', 'M', 'T', 'z', 'q', 'y', 'D', 'R', 'J', '5837', 'W']
[EX A]:
DyqzTM7033069