/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
 
		String s = "nm@ert.com";
		String rx = "^(?=[\\x00-\\x7F]+$)(([^<>()|\\[\\]\\\\.,;:\\s@\"]+(\\.[^<>()\\[\\]\\\\.,;:\\s@\"]+)*)|(\\\"\".+\\\"\"))@((\\[(2([0-4]\\d|5[0-5])|1?\\d{1,2})(\\.(2([0-4]\\d|5[0-5])|1?\\d{1,2})){3} \\])|(([a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,}))$";
		System.out.println(s.matches(rx)); 
	}
}

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