What is the average heights of Italy players?
average heights refers to Avg(height); Italy is name of country
SELECT CAST(SUM(T1.height) AS REAL) / COUNT(T1.id) FROM Player AS T1 INNER JOIN Match AS T2 ON T1.id = T2.id INNER JOIN Country AS T3 ON T2.country_id = T3.ID WHERE T3.NAME = 'Italy'