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

using Mint = atcoder::modint998244353;

int main()
{
    int a, b, c;
    scanf("%1d%1d%1d", &a, &b, &c);
    cout << max({a, b, c}) - min({a, b, c}) << endl;
}