#include <bits/stdc++.h>
#include <atcoder/all>
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,b) for(int i=b-1;i>=0;i--)
#define rbit(i,a) for(int i=0;i<(1<<a);i++)
#define all(x) (x).begin(),(x).end()
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a = b; return 1; } return 0; }
typedef long long ll;
typedef long double lld;
using namespace std;
using namespace atcoder;
using mint=static_modint<1000000007>;
const ll mod=998244353;
//const ll mod=1e9+7;
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};
const string zton="0123456789";
const string atoz="abcdefghijklmnopqrstuvwxyz";
ll gcd(ll a,ll b){
    ll r;
    r=a%b;
    if(r==0){
        return b;
    }
    else{
        return gcd(b,r);
    }
}
typedef pair<ll,int> P;

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