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]: 2, 12, ['9797', 'D', '41', 'Y', 's', 'u', 'X', 'Q', '2437', '7385', '7137', 'S', '6367', 'w', 'f', '7021', '7685', '7413']
[EX A]: S731758377342QXusY14D

[EX Q]: 1, 9, ['g', '3007', '4827', '6665', '711', '6997', '137', 'X', '7383', 'q', 'v', 'K', '267', '3691', 'G', '7925', '8327', 'l']
[EX A]: 3837X7317996117566672847003g

[EX Q]: 16, 19, ['3791', '2657', 'i', 't', 'u', '9099', '6539', 'U', 'E', '4905', 'a', '3961', '1695', '3097', '3103', '4457', 'T', '6209', '9697', 'Y', '4549']
[EX A]:
79699026T7544