IOException

import java.io.*;
class Demo40
{
public static void main(String args[])throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("enter surname");
String surname=br.readLine();
StringBuffer sb=new StringBuffer(surname);
System.out.println("enter last name");
String lastname=br.readLine();
sb.append(lastname);
System.out.println(sb);
int l=surname.length();
System.out.println("enter first name");
String Firstname=br.readLine();
int b=Firstname.length();
sb.insert(l,Firstname);
sb.insert(l," ");
int c=l+b;
sb.insert(c," ");
System.out.println(sb);
}
}