#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using ll=long long;
using Graph=vector<vector<pair<int,ll>>>;
#define INF 1000000000000000000
#define MOD 1000000007
#define MAX 1000

int main(){
  vector<char> c(3);
  cin>>c[0]>>c[1]>>c[2];
  int m=9;
  int M=0;
  for(int i=0;i<3;i++){
    m=min(m,c[i]-'0');
    M=max(M,c[i]-'0');
  }
  cout<<M-m<<endl;
}