#include<stdio.h>#include<string.h>#include<math.h>#include<algorithm>using namespace std;//typedef __int64 lld;typedef long long lld;int main(){    lld n,m,ans;    //while(scanf("%I64d%I64d",&n,&m)!=EOF)    while(scanf("%lld%lld",&n,&m)!=EOF)    {        if(m>n)            ans=m-n;        else            ans=n-m;        //printf("%I64d\n",ans);        printf("%lld\n",ans);    }    return 0;}