class Scambio{

   public static void main( String[] aa){
// Swap xor algorithm, vedi
//      http://en.wikipedia.org/wiki/XOR_swap_algorithm
    
     int x = Leggi.leggiInt( ), y = Leggi.leggiInt( );
        
     System.out.println("x="+x+"; y="+y);
     x = x ^ y;		y = y ^ x;		x = x ^ y;
     System.out.println("x="+x+"; y="+y);
    
     long a = Leggi.leggiLong( ), b = Leggi.leggiLong( );
        
     System.out.println("a="+a+"; b="+b);
     a ^= b;		b ^= a;		a ^= b;
     System.out.println("a="+a+"; b="+b);
    }
}