public class Leetspeak{

  public String encode(String source){
    StringBuilder sb = new StringBuilder(source);

    for (int i = 0; i < sb.length(); i++){
      switch (Character.toLowerCase(sb.charAt(i))){
        case 'a':  sb.deleteCharAt(i);
                   sb.insert(i, "4");
                   break;
        case 'e':  sb.deleteCharAt(i);
                   sb.insert(i, "3");
                   break;
        case 'l':  sb.deleteCharAt(i);
                   sb.insert(i, "1");
                   break;
        case 'm':  sb.deleteCharAt(i);
                   sb.insert(i, "/^^\\");
                   break;
        case 'o':  sb.deleteCharAt(i);
                   sb.insert(i, "0");
                   break;
        case 'u':  sb.deleteCharAt(i);
                   sb.insert(i, "(_)");
                   break;
        default:   break;
      }
    }
    return sb.toString();
  }

}

abstract class Encoder{
  public abstract String encode(String source);
}