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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string username;

            Console.Write("enter your name:");
            username = Console.ReadLine();
            Console.Write("welcome!{0}", username);
        }
    }
}