Problem:
Score : 100 points

Problem Statement

It is September 9 in Japan now.

You are given a two-digit integer N. Answer the question: Is 9 contained in the decimal notation of N?

Constraints

10≤N≤99

Input

Input is given from Standard Input in the following format:

N

Output

If 9 is contained in the decimal notation of N, print Yes; if not, print No.

Sample Input 1

29

Sample Output 1

Yes

The one's digit of 29 is 9.

Sample Input 2

72

Sample Output 2

No

72 does not contain 9.

Sample Input 3

91

Sample Output 3

Yes

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

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

namespace A
{
    class Program
    {
        public static void Main(string[] args)
        {
            var n = ReadLine();

            var result = "No";

            if(n[0] == '9' || n[1] == '9') {
                result = "Yes";
            }

            Console.WriteLine(result);
            ReadLine();
        }

        /// <summary>
        /// stringを一文字ずつintにキャストして配列に変換します。
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static int[] StringCharArrayIntArray(string str)
        {
            List<int> b = new List<int>();
            for (int i = 0; i < str.Length; i++) {
                b.Add( int.Parse(str[i].ToString()));
            }
            return b.ToArray();
        }

        public static string ReadLine()
        {
            return Console.ReadLine();
        }

        public static int ReadLineInt()
        {
            return int.Parse(Console.ReadLine());
        }

        public static string[] ReadLineStringSplit(char a = ' ')
        {
            return ReadLine().Split(a).ToArray();
        }

        public static int[] ReadLineIntSpilit(char a = ' ')
        {
            return ReadLine().Split(a).Select(x => int.Parse(x)).ToArray();
        }
    }
}