#include <bits/stdc++.h>
using namespace std;
using G=vector<vector<int>>;
typedef long long ll;
#define rep(i,l,r) for(int i=(l);i<(r);++i)

int main(){
	string s; cin>>s;
	vector<int> v(3);
	rep(i,0,3) v[i]=(s[i])-'0';
	sort(v.begin(),v.end());
	cout<<v[2]-v[0]<<endl;
}