#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cmath>

#define rep(i,n) for(i=0; i<n; ++i)
#define in(a) cin >> a
#define out(a,b) cout << a << b
using namespace std;
using lint = long long;

int main(void){
    int i, j;
    int n, m;
    string s;
    in(s);
    vector<int> x(3);
    rep(i,3) x[i] = s[i];
    out(*max_element(x.begin(),x.end())-*min_element(x.begin(),x.end()),endl);
    return 0;
}