10055 for Tori

import java.util.*;
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        Scanner in = new Scanner(System.in);

        while(in.hasNextLong())
        {
            long a = in.nextLong();
            long b = in.nextLong();

            System.out.println(Math.abs(a-b));

        }
    }
}