import java.util.Scanner;public final class EmailCheck
{public static boolean checkEmail(String email){String regex1 = "[a-zA-Z]+[a-zA-Z0-9_]*@[a-zA-Z0-9]+[.][a-zA-Z0-9]+";
		//字母开头，@后加字母或数字，后面加点，后面字母或数字String regex2 = "[a-zA-Z]+[a-zA-Z0-9_]*@[a-zA-Z0-9]+[.][a-zA-Z0-9]+[.][a-zA-Z0-9]+";
		//..........在regex1基础上，后面加.和其他字母组成的后缀if(email.matches(regex1) || email.matches(regex2)){System.out.println("合法邮箱地址");return true;}else{System.out.println("不合法邮箱地址");return false;}}public static boolean checkabc(String email){
		//判断是否包含 某字符串，判断是某个网站的邮箱if(email.indexOf("@abc.com") > -1){System.out.println("abc");return true;}else{System.out.println("非abc");return false;}}
}class Entry
{public static void main(String[] args){Scanner input = new Scanner(System.in);String email = input.next();EmailCheck.checkEmail(email);EmailCheck.checkabc(email);}
}