using System;
//1c
class Point{
public double y;
public double x;
}
Point h = new Point();
Console.Write(h.x );
Console.Write( h.y);
double num = double.Parse(Console.ReadLine());
double num1 = double.Parse(Console.ReadLine());
Point K = new Point();
K.y = num;
K.x = num1;
Console.Write(K.y);
Console.Write(K.x);