#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,m,n) for(int i=m; i<n; ++i)
#define repl(i,m,n) for(ll i=m; i<n; ++i)

int main(){
    string s;
    cin >> s;
    int 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;
}