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import java.util.Scanner;

class String25{

public static void main(String[] args){

Scanner s=new Scanner(System.in);

String str=s.nextLine();

String pan="[A-Z]{3}[0-9]{4}[A-Z]{1}";

if(str.matches(pan))

System.out.println("Valid");

else

System.out.println("Invalid");

}

}