-- CITIES WITH LENGTH 
WITH MAX_MIN AS (
    SELECT MAX(LENGTH(CITY)) MAX_LEN, MIN(LENGTH(CITY)) MIN_LEN
    FROM STATION
)

SELECT CITY, LEN_CITY
FROM (
    SELECT CITY, LENGTH(CITY) AS LEN_CITY, ROW_NUMBER() OVER (PARTITION BY LENGTH(CITY) ORDER BY CITY ) RN 
    FROM STATION 
    JOIN MAX_MIN 
    ON LENGTH(CITY) IN (MAX_LEN,MIN_LEN)
) T
WHERE RN = 1;