#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(b<n<s){ cout<<b-s; }else if(b<s<n){ cout<<b-n; }else if(n<b<s){ cout<<n-s; }else if(n<s<b){ cout<<n-b; }else if(s<b<n){ cout<<s-n; }else if(s<n<b){ cout<<s-b; } return 0; }