#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include <iomanip>
using namespace std;

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