using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var phoneList = new List<string>();

            string input;

            Console.WriteLine("Input: ");

​

            while ((input = Console.ReadLine()) != "")

            {

                phoneList.Add(input);

​

                for (int i = 0; i < phoneList.Count; i++)

                {

                        if(input.StartsWith("9 11") || input.StartsWith("9 1 1") || input.StartsWith("91 1"))

                        {

                            Console.WriteLine("NO");

                            Console.ReadLine();

                            return;

                        }

                        else{

                            Console.WriteLine("YES");

                            Console.ReadLine();

                            return;

                        }

                }

            }

    }

}

​