UVA 10055 Java

import java.util.*;
public class main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext())
        {
        	long n1 = sc.nextLong();
        	long n2 = sc.nextLong();
        	System.out.println(Math.abs(n1 - n2));
        }
    }
};