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

int main()
{
	char a, b, c;
	cin >> a >> b >> c;
	
	int A, B, C;
	A = a - '0';
	B = b - '0';
	C = c - '0';
	cout << max(max(A, B), C) - min(min(A, B), C) << endl;
	return 0;
}