【高精度】密码

import java.math.*;
import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner cin=new Scanner(System.in);
        BigInteger a,b;
        a=cin.nextBigInteger();
        b=cin.nextBigInteger();
        if(a.compareTo(b)>=0)System.out.println(a.subtract(b));
        else System.out.println(b.subtract(a));
    }
}