package Programmers;
public class 신규아이디추천 {
public static void main(String[] args) {
String new_id = "=.=";
System.out.println(solution(new_id));
}
public static String solution(String new_id) {;
String result = new_id.toLowerCase();
result = result.replaceAll("[^-_.a-z0-9]", "");
result = result.replaceAll("[.]{2,}", ".");
result = result.replaceAll("^[.]", "");
result = result.replaceAll("[.]$", "");
if(result.equals("")){
result = "a";
}
if(result.length()>=16) result = result.substring(0,15);
result = result.replaceAll("[.]$", "");
if(result.length() == 1){
result = result + result.charAt(0);
}
if(result.length() == 2){
result = result + result.charAt(1);
}
return result;
}
}