import java.util.Scanner;

public class Solver {

	public static void main(String[] args) {
		Scanner cin = new Scanner(System.in);
		long a,b;
		while(cin.hasNext())
		{
			a=cin.nextLong();
			b=cin.nextLong();
			System.out.println((a>b)? a-b : b-a);
		}

	}

}