SELECT DISTINCT CITY FROM STATION WHERE CITY REGEXP '^[aeiouAEIOU]';
select distinct city
from station
where substring(city,len(city),1) in ('a','e','u','o','i')
order by city;
SELECT DISTINCT CITY
FROM STATION
WHERE CITY LIKE '%[aeiou]'
SELECT DISTINCT CITY FROM STATION WHERE CITY REGEXP '[aeiouAEIOU]$';