//#include <iostream>
//#include<cmath>
using namespace std;

int main()
{
long long int a;
long long int b;
cin>>a>>b;
if(a>b) cout<< abs(a-b)<<endl;
if(a==b) cout<<"0"<<endl;
if(a<b) cout<< abs(b-a)<<endl;
return 0;
}