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]: 6, 7, ['2289', '1015', 'T', 'e', '4499', 'J', 'B', '5107', 'x', '3103', 'Q', 'Z', 'H']
[EX A]: BJ

[EX Q]: 6, 18, ['7925', 'Q', '6779', '425', '8043', 'R', 'H', 'n', 'R', '4255', 'G', 'p', '5441', 'M', 'u', '8797', '2863', 'N', 'W', 'l', '7147', 'M', '5575', '7705', '4261', '4563', 'v', '955']
[EX A]: N36827978uM1445pG5524RnHR

[EX Q]: 3, 4, ['9701', 'o', '975', 's', 'j']
[EX A]:
s579