#include <iostream>
#include <string>
#include <algorithm> //max min

using namespace std;

int main(){
    string a;
    int i,j,k;
    cin >> a;
    i= stoi(a.substr(0,1));
    j= stoi(a.substr(1,1));
    k= stoi(a.substr(2,1));
    
    int mx,mn;
    	mx= max({i,j,k});
    	mn= min({i,j,k});
    cout<< mx-mn << endl;
    
    
    
    
    return 0;
    
}