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]: 17, 21, ['5503', '2979', '6307', '633', 'n', '9339', '5829', '5291', '8967', 'i', '9063', '975', 'G', '9187', '3227', 'A', '3487', '8187', 'H', '6097', 'H']
[EX A]: H7906H78187843

[EX Q]: 6, 10, ['4631', 'q', '4689', 'w', '499', '3383', '8091', '7699', 'H', '6359', 'I', '267', 'v', '3295', 'H', '4815', 'u', 'o', '5023', 'n', '9471', '7435']
[EX A]: 9536H996719083833

[EX Q]: 8, 14, ['8245', '9807', 'G', 'R', 'D', '9085', '4371', 'd', 'W', '9113', 'm', 'H', 'Y', '9143', 's', '2259', 'u', '7889', 'Q', '4705', '5905', 'B']
[EX A]:
3419YHm3119Wd