#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
#define all(A) A.begin(),A.end()
#define rep(i, n) for (ll i = 0; i < (ll) (n); i++)
vvll G;

int main() {
    ll A;
    cin>>A;
    vll D(3);
    rep(i,3){
        D[i]=A%10;
        A/=10;
    }
    sort(all(D));
    cout<<D[2]-D[0]<<endl;

}