Problem:
Score : 100 points

Problem Statement

Given are two strings S and T consisting of lowercase English letters. Concatenate T and S in this order, without space in between, and print the resulting string.

Constraints

S and T are strings consisting of lowercase English letters.

The lengths of S and T are between 1 and 100 (inclusive).

Input

Input is given from Standard Input in the following format:

S T

Output

Print the resulting string.

Sample Input 1

oder atc

Sample Output 1

atcoder

When S = oder and T = atc, concatenating T and S in this order results in atcoder.

Sample Input 2

humu humu

Sample Output 2

humuhumu

Solution in C# (Mono 4.6.2.0) (judge verdict: Runtime Error)

using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Net;
using System.Net.Mail;
using System.Threading.Tasks;

namespace ConsoleApp5
{
    public class Program
    {
        //static void SendAll()
        //{

        //    Console.WriteLine("Start!!!");
        //    int count = 0;

        //    // Read in the specified file.
        //    // ... Use async StreamReader method.

        //    for (int i = 0; i < 10; i++)
        //    {
        //        SendFinal("hello", "hi", "duongtrungvinh2711@gmail.com");
        //        count++;
        //        Console.WriteLine("Done {0}", count);
        //    }
        //    Console.WriteLine("End!!!");
        //}
        //static void SendFinal(string title, string content, string receiver)
        //{
        //    string myemail = "tomgiongvn.vn@gmail.com";
        //    string mypassword = "tomgiongvn@123";

        //    MailMessage message = new MailMessage();
        //    message.IsBodyHtml = true;
        //    message.From = new MailAddress(myemail, "PHÒNG TÀI VỤ HUFLIT");
        //    message.To.Add(new MailAddress(receiver));
        //    //message.CC.Add(new MailAddress(myemail));
        //    message.Subject = title + " | HUFLIT";
        //    message.Body = content;

        //    SmtpClient smtp = new SmtpClient();
        //    smtp.Host = "smtp.gmail.com";
        //    smtp.Port = 587;
        //    smtp.UseDefaultCredentials = false;
        //    smtp.EnableSsl = true;
        //    NetworkCredential nc = new NetworkCredential(myemail, mypassword);
        //    smtp.Credentials = nc;
        //    smtp.Send(message);
        //}
        static bool lant(int n)
        {
            for (int i = 2; i < Math.Sqrt(n) + 1; i++)
                if (n % i == 0)
                    return false;
            return true;
        }
        static void Main(string[] args)
        {
            //Task task = new Task(SendAll);
            //task.Start();

            //for (int i = 0; i < 10000; i++)
            //    Console.Write(i);
            //var watch = System.Diagnostics.Stopwatch.StartNew();
            // the code that you want to measure comes here

            int a = int.Parse(Console.ReadLine());
            if (a < 3)
            { 
                Console.WriteLine(2);
            }
            else
            {
                while (!lant(a))
                    a++;
                Console.WriteLine(a);
            }


        }
    }

}