#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define fi first
#define se second
#define all(a) a.begin(),a.end()
int main(){
  string s;
  cin >> s;
  vector<int> a(3);
  for(int i=0; i<3; ++i){
    a[i]=s[i]-'0';
  }
  sort(all(a));
  cout << a[2]-a[0] << endl;
  return 0;
}