#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

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

	int a = s[0]-'0', b = s[1]-'0', c = s[2]-'0';

	cout << max({a, b, c})-min({a, b, c}) << endl;

	return 0;
}