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, 4, ['B', '5601', 'v', '7431', 'z']
[EX A]: 1347v1065

[EX Q]: 9, 25, ['u', 'b', '4819', 'm', 'm', '1651', 'H', 'O', '481', 'I', 'g', '8861', 'b', '2641', 'D', '5411', '7731', 'I', '257', 'I', '2055', '5441', '7079', 'D', '93', '6783']
[EX A]: 39D970714455502I752I13771145D1462b1688gI184

[EX Q]: 1, 21, ['X', '1277', 'M', 'g', 'C', 'q', '8331', '7401', '7613', 'B', 'D', 'A', '691', '8811', '7707', '6567', 'e', 'y', '853', 'J', 'i', 'n']
[EX A]:
iJ358ye765670771188196ADB316710471338qCgM7721X