#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for(int i=0;i<(n);i++)
#define Inf 1000000001


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