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]: 5, 6, ['J', '6957', 's', 'l', 'C', 'o', 'H', 'u', 'g', 'P', 'N', 'v', 'S', '6145', 'o', 'z', 'B', 'o', 'E', 'f', '817', 'I', 'k', 'I', '7331', 'x']
[EX A]: oC

[EX Q]: 2, 4, ['B', '5601', 'v', '7431', 'z']
[EX A]: 1347v1065

[EX Q]: 21, 22, ['1933', 'w', '9513', '1573', '7635', 'z', 'n', '3943', 'F', 's', '6109', 'G', '8065', 'm', '1217', 'K', '6461', 'u', 'Y', 'b', 'R', '9637', 'w', '3093']
[EX A]:
7369R