class Program
{
    static void Main(string[] args)
    {
        int aHeight = int.Parse(Console.ReadLine()!);
        int bHeight = int.Parse(Console.ReadLine()!);
        int cHeight = int.Parse(Console.ReadLine()!);

        if (aHeight > bHeight && aHeight > cHeight)
        {
            Console.WriteLine("A");
            if (bHeight > cHeight)
            {
                Console.WriteLine("B");
                Console.WriteLine("C");
            }
            else
            {
                Console.WriteLine("C");
                Console.WriteLine("B");
            }
        }
        else if (bHeight > aHeight && bHeight > cHeight)
        {
            Console.WriteLine("B");
            if(aHeight > cHeight)
            {
                Console.WriteLine("A");
                Console.WriteLine("C");
            }
            else
            {
                Console.WriteLine("C");
                Console.WriteLine("A");
            }
        }
        else
        {
            Console.WriteLine("C");
            if (aHeight > bHeight)
            {
                Console.WriteLine("A");
                Console.WriteLine("B");
            }
            else
            {
                Console.WriteLine("B");
                Console.WriteLine("A");
            }
        }
    }
}