#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
#include <queue>
#include <map>
#include <cmath>
#include <iomanip>
#include <set>
#include <cstdio>
#include <string>

using namespace std;

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