import java.util.*;

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);
		}
	}
}