#include<iostream> using namespace std; int main(){ int n; cin>>n; int g=n/1%10; int s=n/10%10; int b=n/100%10; if(g>=s&&s>=b) cout<<g-b; if(g>=b&&b>=s) cout<<g-s; if(b>=g&&g>=s) cout<<b-s; if(b>=s&&s>=g) cout<<b-g; if(s>=b&&b>=g) cout<<s-g; if(s>=g&&g>=b) cout<<s-b; return 0; }