#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<stack>
#include<vector>
using namespace std;
int main()
{
long long int a,b,ans;
while(~scanf("%lld%lld",&a,&b))
{
if(a>b) ans=a-b;
else ans=b-a;
printf("%lld\n",ans);
}
}