Station 테이블에서 중복제거 한다음 마지막 글자가 AEIO가 아닌 값들을 출력
SELECT DISTINCT CITY
FROM STATION
WHERE CITY NOT REGEXP '[AEIOU]$'
SELECT DISTINCT CITY
FROM STATION
WHERE CITY NOT LIKE '%[AEIOU]'
https://www.hackerrank.com/challenges/weather-observation-station-10