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.
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Question: 1, 3, ['2119', '2237', 'O']

Answer: O73229112


Question: 8, 21, ['2381', '5057', 'o', 'M', '7495', '3787', '3877', '5055', '6055', '4145', 'v', 'O', 'K', '361', 'X', 'H', '357', 'H', '7553', 'S', 'R', 'H', '5973']

Answer: RS3557H753HX163KOv541455065505


Question: 15, 17, ['H', '6089', 'O', '7049', 'S', 'H', 'q', 's', '8247', '2667', '9283', '3951', 'l', 'Y', '6857', '1477', 'o', '2451', 'H', '2413', 'n', '1289', 'k', '4677', '9815']

Answer:
o77417586