//Sample03_22.java
class Sample03_22 {
  public static void main(String[] args){
    System.out.println('H');
    System.out.println('H' + 'X');
    System.out.println("HelloWorld_" + 'X');
    System.out.println('X' + "_HelloWorld!");
    System.out.println(1980 + 'H');
    System.out.println('H' + 1980);

  }
}