using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Contest
{
	class Program
	{
		static void Main(string[] args)
		{
			var yukicoder = "yukicoder";
			var S = Console.ReadLine();
			Console.WriteLine(yukicoder[S.IndexOf('?')]);
		}
	}
}