#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <map>
#include <set>
#include <fstream>
#include <cmath>
#include <stack>
#include <numeric>
#include <iomanip>
using namespace std;

int main(){
    string s;cin>>s;
    int a,b,c;
    a = s[0]-'0';
    b = s[1]-'0';
    c = s[2]-'0';
    int mav = max(a,max(b,c));
    int miv = min(a,min(b,c));
    cout << mav -miv << endl;
}