#include <bits/stdc++.h>
#define FOR(i, n, m) for (long long i = (n); i < (long long)(m); i++)
#define REP(i, n) FOR(i, 0, n)
#define ALL(v) v.begin(), v.end()
#define pb push_back
using namespace std;
using ll = long long;
using ld = long double;
using P = pair<ll, ll>;
constexpr ll inf = 1000000000;
constexpr ll mod = 998244353;
constexpr ld eps = 1e-6;

template <typename T1, typename T2>
ostream &operator<<(ostream &os, pair<T1, T2> p) {
    os << to_string(p.first) << " " << to_string(p.second);
    return os;
}
template <typename T>
ostream &operator<<(ostream &os, vector<T> &v) {
    REP(i, v.size()) {
        if (i) os << " ";
        os << v[i];
    }
    return os;
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    vector<int> v(3);

    REP(i, 3) {
        char c;
        cin >> c;
        v[i] = c - '0';
    }

    sort(ALL(v));
    cout << v.back() - v.front() << endl;
    return 0;
}