import java.util.Scanner;
public class E89{
    public static void main(String args []){
        String regex="[a-zA-Z|0-9|_]+";
        Scanner scanner=new Scanner(System.in);
        String str=scanner.nextLine();
        if(str.matches(regex)){
          System.out.println(str+"是由英文字母,数组或下划线构成");
        }
        else {
          System.out.println(str+"中有非法字符");
        }
    }
}