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());
}
}
}