#include <bits/stdc++.h>
using namespace std;

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

	int a = abc[0] - '0';
	int b = abc[1] - '0';
	int c = abc[2] - '0';
	int ans = max( {a, b, c}) - min({a, b, c});

	cout << ans << endl;
}