import java.sql.*;

import java.io.*;

import java.util.regex.*;

public class test{

public static void main(String[] args){

try{

String s = "";

while(!s.equals("q")){

System.out.print("input:");

DataInputStream in = new DataInputStream(new BufferedInputStream(System.in));

s = in.readLine();

System.out.println("your input is :"+s);

String check = "^([a-z0-9A-Z]+[-|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";

Pattern regex = Pattern.compile(check);

Matcher matcher = regex.matcher(s);

boolean isMatched = matcher.matches();

if(isMatched){

System.out.println("it's a email");

}else{

System.out.println("it's not a email");

}

}

}catch(Exception e){

System.out.println("error"+e.getMessage());

}

}

}