Couldnt figure out what the error was

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<Below this line, add a link to the EXACT exercise that you are stuck at.>
https://www.codecademy.com/courses/sql-table-transformation/lessons/subqueries/exercises/non-correlated-iii?action=lesson_resume

<Below this line, in what way does your code behave incorrectly? Include ALL error messages.>

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```

select a.dep_month,
a.dep_day_of_week,
avg(a.flight_distance) as average_distance
from (
select dep_month,
dep_day_of_week,
dep_date,
sum(distance) as flight_distance
from flights
group 1, 2, 3
) a

group by 1, 2
order by 2 asc;

<do not remove the three backticks above>

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