#include <iostream>
#include <bits/stdc++.h>
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';
        cout<<(max(max(a, b), c)-min(min(a, b), c))<<endl;
    
    return 0;
}