class Program
    {
        static void Main(string[] args)
        {
            const string sample = "yukicoder";
            string str = Console.ReadLine() ;
            for(int i = 0; i < str.Length ; i++)
            {
                if (str[i] == '?')
                {
                    Console.WriteLine(sample[i]);
                    break;
                }
            }
        }

    }