import java.util.Scanner;
import java.util.regex.*;

public class Solution
{
	public static void main(String[] args){
		Scanner in = new Scanner(System.in);
		int testCases = Integer.parseInt(in.nextLine());
		
        while(testCases>0) {
			String pattern = in.nextLine();
            
            try {
                Pattern.compile(pattern);
          	    System.out.println("Valid");
            } catch (PatternSyntaxException exc) {
                System.out.println("Invalid");
            }
            
            testCases--;
		}
        
        in.close();
	}
}