0000FF berries
The school is already mapped. Modified School Building +(building=school) & Modified School Grounds: 1ο Δημοτικό Σχολείο Ηλιούπολης (capitalised 1st letter of "Σχολείο). Feel free to reactivate & provide more info. Resolved by https://www.openstreetmap.org/changeset/55244326