using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Please enter input");

        string input= Console.ReadLine();

        Dictionary<int,string> numberList= new Dictionary<int,string>();

        numberList.Add(0,"");

        numberList.Add(1,"");

        numberList.Add(2,"ABC");

        numberList.Add(3,"DEF");

        numberList.Add(4,"GHI");

        numberList.Add(5,"JKL");

        numberList.Add(6,"MNO");

        numberList.Add(7,"PQRS");

        numberList.Add(8,"TUV");

        numberList.Add(9,"WXYZ");

        if(!string.IsNullOrEmpty(input))

        {           

            string output="";

            int result=0;

            foreach(var item in input.ToCharArray())

            {                               

                if(int.TryParse(item.ToString(),out result))

                {

                    output+=result;

                }

                else

                {               

                    result=numberList.FirstOrDefault(x=>x.Value.Contains(item.ToString().ToUpper())).Key;

                    if(result>0)

                    {

                        output+=result;

                    }                   

                }               

            }

            Console.WriteLine("Output:"+ output);

        }       

    }

}