num = Array.new
num[0] = gets.to_i
num[1] = gets.to_i
num[2] = gets.to_i

hashMen = {
    "A" => num[0],
    "B" => num[1],
    "C" => num[2]
}

hashMen= Hash[ hashMen.sort_by{|_, v| -v}]

hashMen.each do |k, v|
    puts k
end