package com.company;

import java.util.Scanner;

/*
Amon Guinan

Friday, January 25.
Program checks whether HTML sequences have equal amounts of < and >.
 */
public class exercises {
    public static void main(String[] args) {

        System.out.println("Input an HTML sequence.");
        Scanner input = new Scanner(System.in);

        String URL = input.nextLine();
        int x = 0;
        int y = 0;

        while(URL.indexOf("<") != -1){
            URL = URL.replaceFirst("<","_");
            x = x+1;
        }

        while(URL.indexOf(">") != -1){
            URL = URL.replaceFirst(">","_");
            y = y+1;
        }
        while(URL.indexOf(">") != -1);

        if(x!=y)
        {
            System.out.print("Invalid URL.");
        }
        else
        {
            System.out.print("Valid URL.");
        }
    }
}