import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        long a = scan.nextLong();
        long b = scan.nextLong();
        if(a >b){
        	System.out.println(a-b);
        }else{
        	System.out.println(b-a);
        }
    }
}