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]: 1, 3, ['a', '8801', '2379']
[EX A]: 97321088a

[EX Q]: 15, 16, ['1107', '1863', 'L', '6929', '9633', '9399', '4479', 'V', 'o', 'x', '1065', '7955', 'i', '7413', '6237', 'S', '1461', '8481', '7143', 's', 'U', 'd']
[EX A]: S7326

[EX Q]: 6, 19, ['M', 'q', '423', 'h', '9175', '5581', 'E', '3971', '6455', '6029', 'D', '3637', '529', '4011', 'i', 'i', 'F', 'B', '5041', '7809', '285', '5463', 's', 'n', '3707', 'v', '1', 'G', 'G']
[EX A]:
1405BFii11049257363D920655461793E1855