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

string s;
int a[3];

int main()
{
	cin >> s;
	
	for(int i = 0; i < 3; i++)
		a[i] = s[i] - '0';

	sort(a, a + 3);

	cout << a[2] - a[0] << endl;
}