Aleksandr Levchuk
public ruby v1 · immutabledef first_letters(last_names) letters = Hash.new(0) last_names.sort.each do |name| letters[name[0].chr] += 1 end return letters.keys.sortendfirst_letters(['Amberg', 'Levchuk']).join(' | ')def first_letters(last_names) letters = Hash.new(0) last_names.sort.each do |name| letters[name[0].chr] += 1 end return letters.keys.sortendfirst_letters(['Amberg', 'Levchuk']).join(' | ')