List the food type of the restaurant located in 22779 6th St., Hayward City.
22779 refers to street_num = 22779; 6th St. refers to street_name = '6th St'
SELECT T2.food_type FROM location AS T1 INNER JOIN generalinfo AS T2 ON T1.id_restaurant = T2.id_restaurant WHERE T1.street_num = 22779 AND T1.street_name = '6th St' AND T2.city = 'hayward'