public class C {
  

  public int a;
  

  public int b;
  

  public void changeA(int v){
  

  a=a+v;
  

  System.out.println(a);
  

  }
  

  public void changeB(int v){
  

  b=b-v;
  

  System.out.println(b);
  

  }
  

  }